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 0xc99029a31c2ad773a9673f2f5a7225aee17046ac371dfe290297b1b9b77bc7bb. 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/6ace9a78-d6d9-41b4-accc-8d3699024965.json and https://artists.proofprofile.net/proofs/artist/6ace9a78-d6d9-41b4-accc-8d3699024965.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 0x05a64c9ee3b4be0ad0bb4f1648aa0a20015a67374516ba384e6160b743221aa8. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/AUG5L2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358571cd9e0ffb0f047eb97cbd2ed6bbc62f613c47d75f5cfd0ee68e19e7db83. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/AUG5L2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114f12a9425e4afa42e29b0f8725ae9084971ab156b695cdbe72e4544c091a18. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/AUG5L2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68dfe04808bd0fd80027afda88ff64ce2f020b1e91df69541db425af97986de. 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/AUG5L2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d706f9cd50e180498a7a0ca2d92cf2c391cbedfbce80295468718e5d65594a. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/AUG5L2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6275c6635294d3143a3dfe6fb55e175844c4a64e52c622e48797ff5f1b92e83. 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/AUG5L2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777fc14213b3d7b733ce62d582f72fd502a3cd6a027339bca1545de4ac18a03d. 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/AUG5L2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a944b549c802176818025132d3f73efdee8f27bbbbbd218fb73108ce985e61. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/AUG5L2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca32b9de3533a5abc4339129243bdc09c8cb8becea5d6fb0bca50d5a699e505. 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/AUG5L2200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51dfa3e530e3e7c783d359ef10b8beaa2eb20981bc11232c7e46438e86205917. 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/AUG5L2400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049fef07aa6326c15616e381309b266b8b25f98feadb95ab9df44cd94849b745. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/AUG5L2500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca89f9ee4c80a7191ba5d0375617cd2d82ad2ed553b88aa50de39c2f000b99c. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/AUG5L2500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078566af35a67d30036d1b012cc7e50913484ecfda187580ea19c6a00eaf69bc. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/AUG5L2500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x200a4f942a516c2fc45edb16f5f26608423a68e026a1d3006a4ac42f53573e35. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/AUG5L2500013.