{
  "manageEntity": {
    "action": "Save",
    "entityId": "156674",
    "entityType": "Track",
    "nonce": "0xc147ecd2435587a26ed68dfb8b8587a6d98b8812cd8deb66e7bb7576a0d7c8f5",
    "signature": "0xe50b29190d36b2b9914641c6aa2b9c8c03e85a3a7f36827511ad57116c8256ec783d7988daca63a2aec505b5b7fcc01e89308525824bf691ef8c12e9190c33e71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}