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 0x6a356960adf81edc0bfaca971453c3bfed62653fd1f78e66ce14f2e77b4c41fc. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b944b699-3930-4382-b55b-6e7f34e006dd.json and https://artists.proofprofile.net/proofs/artist/b944b699-3930-4382-b55b-6e7f34e006dd.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 0x19d5640d2067cfe61f237796718fd85f8f16b2d52ec8e63524c0f70fa58420f6. 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/TWCC31900256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0696f1492602ab7974133ef89d9aabf15764b6125af6c075097d73416b69764. 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/TWO471600201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e729c3f9b9319af69090ac6fb672983436d936d0e404c251bc0067d464eefa. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TWO471600202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78cadbb1959024a041093469a03a3f51ec66e5e47d06fb51168957118529637d. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/TWO471600203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb9b5fa977d894971c20922d2fee8e73e5edb677a6fd71e5e8b10a0f6db56f9. 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/TWO471600204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4171ee925a7c63c8af9fde7ef1f63b383d61774a836f173be98e366adf241608. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/TWO471600205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c05a916b69b46cf67931e7b25ce6f59d0a167c7dfde252decc8894010e5dd5. 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/TWO471600206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f9df9fca6c7c8c0be8bae229240b126edbf57406520b398bdebd8ee2ab0f73. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/TWO471600207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a77a1ec8bfcef31284e5a497b95a87a89192862c2829d79e1b9ba6075020a7d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWO471600208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e57ad4d39eb48c57e6cca4ff63c18d91baa9a2a0dfd8744501ebf940c221f64. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TWO471600209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055e4b1ea28247caa7d65ed597204b5b2c63ff0d9acf23111e5f1a4f1d60c619. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/TWO471600210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e138471cdefda99a130d854ec5b66f0758b3fcae70188104c9101d01e38c978. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWO471600211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c496fa7bdcd4a73220a93748ce618c687fa2de25e9970cb196e65e24705b98. 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/TWO471600212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef283ddd93796316a8643c87bb3fae3620a82ab0a6e669462481e26c6a34d0f4. 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/TWO471600213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f033c573bf8bc9a61ffbc39e44d210bf5ee02d9c5c0a59f638db02cfffb0fb. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TWCC31907120.