{
  "manageEntity": {
    "action": "Save",
    "entityId": "668897505",
    "entityType": "Track",
    "nonce": "0x6f9da9177f1b3051341e8fe67cd8e893427d30b3f46fe9fb3493ca2f994b089b",
    "signature": "0xe4dcffd7c08d76ef949480dc42857e77ee2222474d290dfceaa6722c4de7584f2c50c5007ff1118d0bc6a939d128f43a49cdb81a0952a78551b5e0d8c0c259891b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}