{
  "manageEntity": {
    "action": "Save",
    "entityId": "753159",
    "entityType": "Track",
    "nonce": "0x010712b8b547b9b73684717090246b0af0325d044049637405d0cf0671369171",
    "signature": "0x741290a97c869778532f29909640f2bf2be98e53e066d423d7641968b4f9f7600a67675d2dc11221c0a47352d43bce0b401cf82f2bb70e759383ae662c32f3681b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}