{
  "manageEntity": {
    "action": "Save",
    "entityId": "1875601538",
    "entityType": "Track",
    "nonce": "0x84e41099bdec1e283a634bc01bd32814a97d47ac7cb2edd9c2103aa837a938db",
    "signature": "0x5271ec9935fb1a6b3e7a8cefbf6fdb2df7406d1a47239e1ba95e6be4bf78c44803f144081c0b63a86e942c94c37ea1de1fc4f91952af2b16d167427f3a2cc4a01b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}