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 0x32a1f499022ab3d41f88e3fb02fa6f0ae6ba6331736520e0c8c83510870f8e63. 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/6d585bb9-c8da-4b25-a12f-c6ae31d18295.json and https://artists.proofprofile.net/proofs/artist/6d585bb9-c8da-4b25-a12f-c6ae31d18295.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 0x8da25809eac82a11c28f9ad550db55e79b3a8ea1aa5982c2317c1cac9995d897. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:40:31Z), 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/IL1021710074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff419fb865c5ac6a68e7efc072490a00abc8fd9f736aa4882000246e0dffb76. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/IL1021810249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ea40db355d44f8a26f3040854c26164932ca508eced93a647d98fcabcf6f4d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/IL1021810266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d0cda282794a26125a7887e191a5a905efac699f83a9653b1a3f1b6d0c1df7. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/IL1022011760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef30383b945a9c3d4a6f9df9c4ebcd291a7a84852f9985c2817dec7cf60f34e. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/IL1022112090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6882dc90a3ffe7f83d5d71d99f371972ba7d594bceba4d2b26ccaef79ebefdbd. 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/IL2DY2200079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b3d3ffe60cd4522e402fc40591bc863f8644b226c398c83de25f152edff3ac. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/IL1012200176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc5b98c7e8e7f658a3a84c6b1e777466cdbb050eb4b48c52d8c6f12a73ab2bc. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/IL1012401687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9bdbfa41787f40c039016ce3621c25a5eaaa397c16265c62a0ac7bf38aad7a. 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/IL1012500489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc5b98c7e8e7f658a3a84c6b1e777466cdbb050eb4b48c52d8c6f12a73ab2bc. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:46:51Z), 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/IL1012401687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed0d9a3c1f0b2d368e224e2725fa624666ca9ae64ac78f3f1e67602b52a394d9. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/IL1012500495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb1f2bf9db365e10f1ebcb5733b438f70e56bc2ed625321377e18a58db7d808. 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/IL7532513764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ad1cae0cf2bd24af21c554727855e8e09e31fb4cabdfaeb9ee16a633b4a5b4. 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/IL1012502476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c90d40d3c0273d2f6f3847bc282a44b741eeed89d0e2544be723fb5e0a8cf7. 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/IL4432001593.