{
  "manageEntity": {
    "action": "Save",
    "entityId": "643225750",
    "entityType": "Track",
    "nonce": "0x562dde555ac8e60279af91aa1b310983e09e52d6c1607ffec3b1f67e440ed247",
    "signature": "0xffde1197ae3bdfa254299bb13392a6eba78559cc43e88d51812ef58617b0aa376b03105a2ce598b885befe182986426c6222ec67671653dad3934ede89517c491c",
    "signer": "0x1Ef5331d98352E3A7eb4f177ae6BbD27cA99eD1B",
    "userId": "771602835"
  }
}