{
  "manageEntity": {
    "action": "Save",
    "entityId": "23657715",
    "entityType": "Track",
    "nonce": "0xbd3524071593498072bf3d7b2c67908fee4ca40c3e81c8d3d38c6bdbc3a55415",
    "signature": "0xb1e5a59f5d11de4f96365d6873f8b98a00e45793189def3145ba8fbaa337bd576c2952d86f58c024351d78a646073f2df486bf8a61825baa69618d905eb421b51c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}