{
  "manageEntity": {
    "action": "Save",
    "entityId": "1549057913",
    "entityType": "Track",
    "nonce": "0x704edbbe4e23331e8960b72319329357003cfd419018130b5a7b586a4644c68a",
    "signature": "0x4c873ae3ff439684505448006b46d50a5057cd3da93f8e3bbb3d18c84cc3fcbc3c034b98f67d6bc354dd533ff54e11bcacbbf30d3784810c31d24896a2f5f5b51b",
    "signer": "0x102a924C1c076Dcb5816d20E32Dcb6F00e75F2C9",
    "userId": "485987672"
  }
}