{
  "manageEntity": {
    "action": "Save",
    "entityId": "1637084645",
    "entityType": "Track",
    "nonce": "0xfa458941bdc822921168c255fd181b861ac1b02909aaa5d0959ecb6c354d1e35",
    "signature": "0xb8cf8f5fafb7654b3eb772e96e794c86803bb2b7ea12f0336df5875e65b3965636ce33c9d0ed3c2f4d6fd0bb2589523d78aabedd6d1dedc40b92095e1c0ab2571b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}