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 0x8b3946d0d5bc3dc5f60ceb8b6ccf104a8ee602c3e789a40421a447f7a1c0eb76. 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/9a1a9733-a069-4ed3-8190-50687daced18.json and https://artists.proofprofile.net/proofs/artist/9a1a9733-a069-4ed3-8190-50687daced18.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 0x5356606f75389ee15cee7c3b582ac201eefcb781910c7bea68a1e9433b84e9db. 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/QZ4JJ1941061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x744274e7a08bc5e0335f79c6b44de78ed443490d2bef2955a1d7f891dc0736bb. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZDA71957470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2cfbadd081f2444a51a497d6eb2062c7f0986d274d24d59ada066731cdf5153. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZFZ52016849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932178d3a0239f65002f0db02744025a34983def6672e22ef1d3dd6e7b687c15. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/USLD91732396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa526c75fd138d202e85863b226552ad357ba0d68378b543f5a3574d902892bb. 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/USLD91736604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd35fd08e102ec44ac9ec477339ed815d8ea0f9795ab91797f2f4f0e856e9c515. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZLBC2311177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ccdba848e15de7d5bf2ec7201778dc1dfb61a671ae181f2d522625bdc9a277. 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/GBEWA2400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceccb32ab700d43e38662b9ddf0ff6d021ed9369111d67c45ca334ddbc20f230. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/SGW502506843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3a8575aaeae1b5d63b916a0ef118230bff40ccf78c0389edde9bfbb90bcd38. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBEWA2401885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7904c5fb3651dd4360bfa9b463c056ea9948c4581a69609ad07c62f710521d0. 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/GBEWA2401300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808c8011e6ed68f6436afd82973c7d742aaa426fd6023a50fa6109a4f463227e. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/ZZOPM2239392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808c8011e6ed68f6436afd82973c7d742aaa426fd6023a50fa6109a4f463227e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ZZOPM2239392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b134d3c7f532dd45038d24a526780122029d32786a31f652346287374523bf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZHN31900764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ccdba848e15de7d5bf2ec7201778dc1dfb61a671ae181f2d522625bdc9a277. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBEWA2400029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9960ca1ac670178c78be5b146710ab9d53888fd658654866ab77ba4e5f86246. 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/QZNWY2311931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee44ba4d04d890430afb2824a1ff9f74fda431895ce47dc43c97dc8e3b9d97d. 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/QM24S2405038.