{
  "manageEntity": {
    "action": "Save",
    "entityId": "769847",
    "entityType": "Track",
    "nonce": "0x9b1b5e635ce8d5f835a94d1a6f0f63a91c369f57a73036bfa628d0a4877e7771",
    "signature": "0xb3a2800be8ddf4f05239eddaca9ce72affe90e8be74a72db20292fb17d40adf6460a37abf4383988c4fff9b0a19c02a4719271190986194fff8a84e0f7e237ea1b",
    "signer": "0x4Aa8154A33F33394BA8De574d71aC98Ba6A47D5a",
    "userId": "645720561"
  }
}