{
  "manageEntity": {
    "action": "Save",
    "entityId": "972775537",
    "entityType": "Track",
    "nonce": "0x65cadf50bbb0ba48da936abad0a4d2ecf146d3e0e58e0bbc02311282ef2f7237",
    "signature": "0x80231c5711d4fc033bb6b95dd425fbf57b23147add8906a1f3af12cd06d9cb333f8260dc6c5ea92ea18205ad8b8c4d09a8986a4a8f4c0312dd9693484080694c1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}