{
  "manageEntity": {
    "action": "Save",
    "entityId": "1744879833",
    "entityType": "Track",
    "nonce": "0xb8545c3756c82dbf7b629c7dfac41463d864138fba33ad059c7ffc9494262af5",
    "signature": "0xce3b008decb68094731e63fd007910d75d54c17134da35fcb1389fe383e00fca1ec6e28dfc982025cad1f6e7e6aa344a7f9335cb2c6bc439f19e01d473f1c1331b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}