{
  "manageEntity": {
    "action": "Save",
    "entityId": "1186641141",
    "entityType": "Track",
    "nonce": "0x21121a2ce7e472e3acdfac1a7116b4d49f1097bc5260c542b541bc933a6b9d3e",
    "signature": "0x1678c18f033c1ff323c1bf6d12bd09c3b2ddeb15708e5c0baf39a397df8498ee5821544f20584660385f400ddc9d52fd0f63c1c4129e7c1478d621e8f9643a5a1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}