{
  "manageEntity": {
    "action": "Save",
    "entityId": "1087737662",
    "entityType": "Track",
    "nonce": "0x7fd4b66e2501c81771c2366d64f89d1e9b3e11dcf2513c8ca3e9129a8f6301d5",
    "signature": "0x07f95540e33a4aae65af31c52379d4a89fb8dd666bcca1232789e189bd4e241d7318b775c5aa923366c959ec8c70ea646c4e8cfbc6333d9774e175edafceccc41b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}