{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573547152",
    "entityType": "Track",
    "nonce": "0x2b8fdff3d63a2313f66a3864e018fd5d12732f0a4c30fd462c27b8128a3be7f0",
    "signature": "0x88d3aabc9a34fdf19a4496ec23861f8b9878b56952676c5cf227640019c033bd3428544f996be729c8d4ccdfba14a7cd16dd5203b425ce5b9e024ee821a97b831b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}