{
  "manageEntity": {
    "action": "Save",
    "entityId": "702221210",
    "entityType": "Track",
    "nonce": "0x4db702bcdc521e44328e1715ec446f5d72b7e7a5aaf0511ebdd82550d9eef51a",
    "signature": "0x97535184b5bdfa6868aef524a14247ec70a08c31ed607a18bc4cb4b25ea2ce6075e1119329bfd4f3024e168aefc6c1b0a23c5f0c90ce202abe5877548b0ca64e1b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}