{
  "manageEntity": {
    "action": "Save",
    "entityId": "815887057",
    "entityType": "Track",
    "nonce": "0xda9c1d8fb0d94060aa24e1a254410f8a71fd11022129503253ac9aab4f35980a",
    "signature": "0x5073344020471900e0d982c99d801575af1bd099e3310491391761462ca5a02b5c7f6168c21c6e0a42b45507a2624991ee7f857bfbec25aeef0b6d42acc15a1c1b",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}