thumb|Philip V, King of Spain wearing two types of sash: a red waist sash and the blue sash (Cordon Bleu) of the Order of the Holy Spirit A sash is a large and usually colorful ribbon or band of mate
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ad59b29d7755c5f88c76711f10a33290fe446b777ad84b5b03414d123ad4714. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0b77970-5f47-43c3-9fcb-5239c8bb8083.json and https://artists.proofprofile.net/proofs/artist/b0b77970-5f47-43c3-9fcb-5239c8bb8083.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcb4b7e2eeac944d5c49e5b1f95a3bdab4224181f58cf761ed2d0046f53b499. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ4JJ1651140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4a5ecfb47509d4a53635e7a78e6536c15ac560cb68682cdb06156f02b04562. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-16T01:56:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEB1927784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1453799b5ab332f5d35b84cb0d779b0b6416cc9ce8638be2cf6894faa7234789. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEB1927836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6355206a52693c9a5dd9a6c84162dc9405fb6757add94fcb31f2774c7fcbf160. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAEB1927881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bbc7e2cd2e6de3e5ade2157b2d089d5773ce773cbcf8281068a4ee9cd4b9fea. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNC2093907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cb36a778567c41e55358e6a82a30b2f1a76ad1a0a34a892bba00c20fcc00c0. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWW2064300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc567d7de48572b2aa7f45b662387168d7abf65ede3aa409b53c39465fb65bca8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWZ2037381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedc968ffd6f5acddf68aa046654c4b06ee4673c9158191bdbde3a39b7589c667. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFZ62259629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b5db58641e01b84f1e43c84d9eb77c8c4d0720047f1b107ee5c78eaf2cc128. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZHNA2204177.