{
  "manageEntity": {
    "action": "Save",
    "entityId": "73776572",
    "entityType": "Track",
    "nonce": "0x4ff930a6a5bb6f1a7cbd81eac0dba3d11a8bba332e9c1c112add80ca0e02b439",
    "signature": "0xba9ef3c2c350e733861afc077b3dee29d02c3c60bc07653b94d16a0275005e0c1619ba9a2815517988d428b60b32809ce997e82d709bd9a9c59bd5e644b674271c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}