{
  "manageEntity": {
    "action": "Save",
    "entityId": "260135385",
    "entityType": "Track",
    "nonce": "0x959c18c377f16c3ed5cf7895cfcb1711a523fd6326e81b33fcd728fbe469ddd7",
    "signature": "0xfaafff745af378f6092048689c326ff4db076cd7c12347d23be26db3f33847054e07388ea650ffa8fc8f8145d435ff430d69cbb2148c7dbb3c8c5e7838e5778f1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}