{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507485962",
    "entityType": "Track",
    "nonce": "0x3150f98d557d5086e3f3097c93f2490b4f590304768bcc45d96b53df5e6c5214",
    "signature": "0xf6379a14ad6c9fbb64997ef91d7c48364a342ab5a347cc4c54b87d8a0870da7e1098295c4daf9a0fbdc411f8a0bd7e719896114332442b93cbc8c7038d5ff7e71c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}