{
  "manageEntity": {
    "action": "Save",
    "entityId": "1373845699",
    "entityType": "Track",
    "nonce": "0xc94c98d4c71a64695263a8b36540191fe73fc96225bf41c8e025b2ba9e42d110",
    "signature": "0x9e6181b2641d38111f750fc516857f4354838110b7c34cc7008152ef83ac9e2f1093aa53d2a44070c4e2fd1a34a731179bda73ecd4c409d8b673543bbb887ba11b",
    "signer": "0xb51B50C9b7d88C66d31539161F4BA9Dd72a17dF5",
    "userId": "465531556"
  }
}