{
  "manageEntity": {
    "action": "Save",
    "entityId": "2073609044",
    "entityType": "Track",
    "nonce": "0x7f977573966005cc689bbcac2b2f3a5b7e4ca3481254f65efb7a73daa5b5866c",
    "signature": "0xea7f63d2cac338defa5beb3503296fcb2decd6d7457d482e4aff0d73b3ffffb249bda27e2fec33e375eff1ab278bc64a23c3d2411604a8669f86c5ade6e719121c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}