{
  "manageEntity": {
    "action": "Save",
    "entityId": "410894147",
    "entityType": "Track",
    "nonce": "0xd89bb67f4f2d82636114f3ff95f18ce1856aab0d66bfc412b9a4b1fd6de61974",
    "signature": "0x53695c9e8d740569e4d6775003fefe7b2d6a5c3874b3e883e33427f14b18c177376cca84e02aba31c8b9ce1f08544a2597b0d63d0baa6209b2ea4ff4d680b5e41b",
    "signer": "0x1F9dC682fadBAc94c0Dd4ca2232a3f490704a737",
    "userId": "737872723"
  }
}