{
  "manageEntity": {
    "action": "Save",
    "entityId": "81539",
    "entityType": "Track",
    "nonce": "0xb7f8b870d18eb30105bc697e49624df50ff1476bc3e27eda0d42a5da0ec25352",
    "signature": "0xeff2b0530403647f687de3a283d4f9252392f814ad8d993a26c83ed401741f1d134751373702b502b86774c39b6f7fd7a3e0c3cf1723aebcaf7c7ae03340705c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}