The Marbles may refer to: The Marbles (duo), a British/Australian duo The Marbles (quartet) (1965–1966), an American rock band from San Francisco
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 0x2b67bfb4f67c11b7ad5941c6f4040f7209012067b9175a8cea2f16b4db01155a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d6d0dde-e7d6-4cd1-a7ba-5c0d736845d8.json and https://artists.proofprofile.net/proofs/artist/2d6d0dde-e7d6-4cd1-a7ba-5c0d736845d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).