{
  "manageEntity": {
    "action": "Save",
    "entityId": "1371039374",
    "entityType": "Track",
    "nonce": "0x2f3459cbc2ffb617998be4deba61ef8dacbf2206ba1d53070a84bc5c29fb42d7",
    "signature": "0xfd0d6b61f234da8d6f507dd1400fb6c6d43941038831c91b5d5ef05a65b04d0710ab0314d27ed1556a930019149398652beae9ac03a0c602103437318989bfd71b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}