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 0xfc5cf1f5f079b812f9c64301bf41c808b46eb16089c46f0019e7f7c7d135ffcb. 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/00439c52-2543-455a-87cb-3307e32cab8b.json and https://artists.proofprofile.net/proofs/artist/00439c52-2543-455a-87cb-3307e32cab8b.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 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 0xa68220647ee4f57ac0e442d4d166044348f87b9fa8e732bcbf4e61df579f838d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRX762176384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d596d1cdf48c621bbb466e0aa3c46adc212fc495a089293560817125e4cce3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX762227012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e069d97b570ddb93fb3c0ab55d835ba59a0986152c0014f43481015981bc74. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/INT102201278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2356ad4b82977cafae44390a0800ae70041b5b8208315fd3f81983be4397c726. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DGA062334448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afed34f2cb81d701da160c071548ac519e9a56c23f5a534d107c7c43a9e0850. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/DGA072322891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de2676c348809b42b84fd7671ad632c334c08bcd4f57e6e36feff2d8385d77c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QMFMF2306504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72842b7f2aaeb489ca5bd1e79c11e36dd18151030c95dad702265c0c2fc10e26. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR96X2476341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b56674b966b8d0a7f166dfb0367045c8a8988daf3284b0f99af3a429c7eb604. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/FRX872431143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cb962e2482ede070fe8383967803a5939f26f26da30af69021550d817227ed5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/DGA092458914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb377a80010b939561d0ef8dcab7c31d5c538ec3703ba1823fadc5288906f45c2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DGA0H2418090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccdd930a03d5a82b6a17c6a1ec61da28d698f2d9e19eaac5ce154a5dae5152f. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DGA0L2467812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920fa5dd942315932820429815a0765650a7df62c4aba4c6519e783d012df684. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/FR10S2570530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69de959731eaeb656315bab1f7906f9c8883d8ad467e83194638f0a108ecbe7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/INV792512169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fd6254e80b2a397554607d3c61b45c7ea1821bc826c5bd456d9bad13f3c1ea. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/INT102201244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b5b2d14d66103989bb71ece33e3ea61156ee6da96ef15cc0a3e7ca4387b4b0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA072235836.