{
  "manageEntity": {
    "action": "Save",
    "entityId": "1621669574",
    "entityType": "Track",
    "nonce": "0xe3e4b13f9f09847110a028eba352a35f6c1ecdc6960842cbd1b6a28ff044ee51",
    "signature": "0x7947fa508e8badefcb72206b981becb857d836a432b059e74e18427c08ac8c6d3f1e74e22e94e5ddc0044be406381bae43b0aa169ab3618f64556274c42f6e7e1c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}