{
  "manageEntity": {
    "action": "Save",
    "entityId": "1357848476",
    "entityType": "Track",
    "nonce": "0x4e903b236fbb09b17b10756abb20dc8e84e14304657e1c325df6ee949495a79f",
    "signature": "0xcd10e02ea65d2530338f4c5b3e7b9d180766312a0bb6e93295e4cf86c877f8350780673c98f216df319f8ee5aa099eb706009b6c29bd89c68b700c1f1bd39e991c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}