{
  "manageEntity": {
    "action": "Save",
    "entityId": "368549",
    "entityType": "Track",
    "nonce": "0x7f15e39d98864e061ec255d39e26409e9cc929ed19f2060efd058c9671ccc3b3",
    "signature": "0x6411cd654f6bf02562ddbc108c9aa366f2d10b34650ff37635154b6d76f65fb101d10becc6acae7dafde7f62d5a7c4b0e4b90029ecc266086a685ce2c4b9c2da1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}