{
  "manageEntity": {
    "action": "Save",
    "entityId": "217125360",
    "entityType": "Track",
    "nonce": "0xe56580df310583e05a32c3a0c37c5ae3d2fefde4bb6d8555a8f4e8de5e46d220",
    "signature": "0x5290fda527e104d3c7c229d8b8a6ac52109f407a05daedbdbcabd635aaffc6d842e8282558c5c9e5d7eaf118f78067106fcb6807cbe46963ed45aa7c13a43bd61c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}