{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507736639",
    "entityType": "Track",
    "nonce": "0x162382d98fb44964dce20a95e316e4e7ce556f07d13fce7cab8ebb43381913dd",
    "signature": "0x6164873bc2316aec20f874807aaee611c0a377ad82f7dc62739ef72dfbac749c69cb71cb985f43a230bbb91bf7159ff5bd21fd968c8beadf59366736b1ae271a1b",
    "signer": "0x6754A920da1003d0904BdFf228A6E217Cd12bF5E",
    "userId": "105562689"
  }
}