{
  "manageEntity": {
    "action": "Save",
    "entityId": "223273893",
    "entityType": "Track",
    "nonce": "0x554568101c0c17a7527b459e701a5c6440331b3ae66cec82b71c91060c878931",
    "signature": "0x4dd613f688c8d07fa9bf226576bf63c1214d6921af6ed13d2adf7a89ee4a8ac046a80e1bf44ee16d0bd32755e9e1a226c63ed63ce2aa8d02568c4754a20256f61c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}