{
  "manageEntity": {
    "action": "Save",
    "entityId": "21737",
    "entityType": "Track",
    "nonce": "0x5619ba21fc4a9fc3a9f88afc57af2752d74a532f7c53798ff5102ab2bda346e6",
    "signature": "0xf284e3fe1141f52ddd193905bdddd16906f40b9429d3a97d1528d427f45f2f0377f36d6f38fecb794ba4d1025647ab24cc390682b50b6f56668106d07cea26471b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}