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 0x2641703197a7de35a9fdd37af6b848e1e8330052bd153f2a97f1edb4136c1d70. 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/afa9c44f-1339-4cbe-88e1-63ccaedccab6.json and https://artists.proofprofile.net/proofs/artist/afa9c44f-1339-4cbe-88e1-63ccaedccab6.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 0xf582049e4cdaeb2771ee36edb5cba5cd294d4088df599bce4f82eaba5a6bcfbf. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/US6PD1900987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec453b5e1150769b3522d6aa8ad437d1d9811bc78e77460b6e8969c2a62888a2. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/US6PD1900986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaa788344b76eb47fb85d4c080878dbf9e618e94fc838db85479b8a5ad7aba1. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/US6PD1900992.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c703e8adde96384886f153be47c4450c6d69312b4568f0a22d843697bce56e. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/US6PD1901051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0fcb2b06eeea6a1473e16bd351676b6e09efe8863318e736f457a5d609991c. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/US6PD1900990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559bece37213580e094f5dbf3ce717d12989625303b444a720909de1b6beb7f9. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US6PD1901048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629a91c42ac1606407caf0521851a75677180a7b25065b01cf24532bbc68e63a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US6PD1901052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256579e801423bf902fc064b2b9ec227775a377d496a77247fe105600ed50fdf. 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/US6PD1901053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d5e9ac5962ca99f411cc8d1a1540e0377ca89441d5a4eac28718f85debaa67. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/US6PD1900993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be1980d80baafd35f22f27f083229fcb16f4052711ce244f16e1fdb315e0e2d. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/US6PD1900989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342ccd1d4399fb2fe47e8419d7b05aa44440997079a8588fb747ce92b9a48e0a. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/US6PD1901049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bc45ec22dbbffa8b1b84ea73d8f9dba74f392cf83a139f663d320526bcf64bf. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/US6PD1901054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6ec1ef9f6ddda304a8ac3111df046358a025c76ec5c884dc444c7821216ca6. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/US6PD1900984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7019e141ceae6d36fd4b5197f54077ca700479ef969b0f9688097ef919abb7. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QM6MZ2002372.