{
  "manageEntity": {
    "action": "Save",
    "entityId": "558130250",
    "entityType": "Track",
    "nonce": "0x977a5616ec2173f053453be1889f72626b51a152eb96df42410c046e632e1f7d",
    "signature": "0x8caac8eb335a6f17556632b5e3a401df6f2b99861b32e54d4fd30a9d334426206176058e54e3af28f3b60b20c4d7fee65507aa7b0d3f279bf3b4f19abcdd28d81c",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}