{
  "manageEntity": {
    "action": "Save",
    "entityId": "1564711187",
    "entityType": "Track",
    "nonce": "0x7f40ff4fc8a66123fdc7a54551c00832dc5c52868d9794d576490ec139f1916c",
    "signature": "0xab59cfe5708d727eb0cd3c7654eacf73fd58deb9fc5a134a771d530ad9b0aaf15b1a94bf01c2dbff958973bc358fa6e0ed12d36375e52b94e8e84baaba6d85a61c",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}