{
  "manageEntity": {
    "action": "Save",
    "entityId": "768219531",
    "entityType": "Track",
    "nonce": "0x37cc7f2d331d6d47cd66c97900f3d76f7a2fed48b298b0f2f1d45a796a3efc84",
    "signature": "0xd42715bfb4d86da2ba6efbbe607a16e40802baa35ad0d5c42f87e402c620f5e82d4cc046d0eaaf2ca34d18de4a81446966a3b1af43875c4cf5bcaad73dddab301b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}