{
  "manageEntity": {
    "action": "Save",
    "entityId": "2090953371",
    "entityType": "Track",
    "nonce": "0xf3fe9949fb270ff5e1b3abebac245d3df92071daf3e9811fbd7da9b1f79ebb9a",
    "signature": "0x4435f924270acfb1161e4ebf842c68f74cac45cf79032fc6e2e057fb7a69e51c09f4868f28bcbbbc5056761eb5e7d7d641df27eafec892d1cd45877e380f88d01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}