{
  "manageEntity": {
    "action": "Save",
    "entityId": "1749364341",
    "entityType": "Track",
    "nonce": "0x72ff9176b3464d298268eb4547ea9769b05278b5d583c529e1538c1dc42fbefe",
    "signature": "0x54adb3944a1e109749498a07552e5db86388c3df73b0fd49909d8a39ac05a30109015caca4c215d3a488b7e9ca51fdeb80f42ea40f2b2fcb654a92fe6a14b2361b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}