{
  "manageEntity": {
    "action": "Save",
    "entityId": "696356381",
    "entityType": "Track",
    "nonce": "0xcd3bc0b71c65eb6e4a4a0f5b39b9704cdfef073aaa365a562caa74d0fb697af3",
    "signature": "0x72f3f1600367b0208166d4ad96d14abf3c9728c0ec76f05b3b9887caed56be0c78735151e8381fd29bd22f848f31539a33e1a944d1678c67ee8e0aa8d8113a451c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}