Amber Marshall may refer to: Amber Marshall (actress) (born 1988), Canadian actress, singer, and equestrian Amber Marshall (soccer) (born 1999), American soccer player Amber Marshall (tennis) (born 2
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f18e32031385de04c0716894138c9118f31a240b8e82e36075d5cac5e82c52. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b895681-5004-4083-8079-e8adf7b12482.json and https://artists.proofprofile.net/proofs/artist/5b895681-5004-4083-8079-e8adf7b12482.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).