{
  "manageEntity": {
    "action": "Save",
    "entityId": "388565",
    "entityType": "Track",
    "nonce": "0x483a06d890c82b96eaf6aaaf26feb7ee9377d6259a63cbaa31d107f5a38d8d75",
    "signature": "0xa7bc432f20904ab3cc28c86b7cc02d40028d1f89b077b41e404c6257e0eaf0a1643b2f6e6f40475f9ce093606fed2d88eebac594415aca72ffa0b70d036bc5221c",
    "signer": "0xDD3Cb841c7f19ec5581F8E2b14d6f7a58B92d0F7",
    "userId": "582464754"
  }
}