{
  "manageEntity": {
    "action": "Save",
    "entityId": "909612864",
    "entityType": "Track",
    "nonce": "0x28e3e5613b9d0ed5201933bd03ee5aa0be969a7ff29b8645cc4f59c2c1b89901",
    "signature": "0x67af94cc2af55ebb26f800e9b420d34d8bb1a1a721e8301d5eb621538a1b083f7e12c2e48a263fbcbdca86e3b29bcec375f1d76fc51813ce0c2e53cee7adddff1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}