{
  "manageEntity": {
    "action": "Save",
    "entityId": "270645737",
    "entityType": "Track",
    "nonce": "0x58ac64394163bdb003c63ee7b76fa70dd7477e2386f0a36451ebbc6aa2652540",
    "signature": "0xc455f8baac549616d5b96447fa65450f0b13ab462226f1610851d460aecc9415306c21f4496997f15cb8acc26d46e377e6fb800955bdf4ecbc5ba4faed4d9afe1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}