{
  "manageEntity": {
    "action": "Save",
    "entityId": "902786764",
    "entityType": "Track",
    "nonce": "0xa000e816dc9e5c7e285d7627dc57ac87384c0fc9e0f2748825e38d6d4e0d63aa",
    "signature": "0xa703def8f4c837f6a2f190a7cb58dbd621e2f2742609af3d9582317f76eb2f276980663e9d1f7a9b13f6e6e8dadbe18bfa93b577a136b279907d7ddf07ab08561c",
    "signer": "0x48c57b64a5a12Dc7C7742Fdb629EEce52FF5591D",
    "userId": "930634116"
  }
}