{
  "manageEntity": {
    "action": "Save",
    "entityId": "884578",
    "entityType": "Track",
    "nonce": "0x8a5fcc6fe4b8350ef3c0762bc8194e2d6976e67f0a330c73e4e5f709419ebd51",
    "signature": "0x0e7d75c52be1342bbbd732285f0069e549d82db144f49133370316fbc0a6eb262c9deb8b1a2b979d52264eb61fc4c9eeee35d9c4336dc505e10185540c43a0bb1b",
    "signer": "0xF08935327AeC6306C8d0eb92999567e5496848C9",
    "userId": "989073793"
  }
}