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 0xf866871ab5b59ec75d1d3c90a3991e2de3047493d74a3b7f8053aa4326b766fc. 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/1ae0797b-3c37-473d-9f2a-a67c75e2fe14.json and https://artists.proofprofile.net/proofs/artist/1ae0797b-3c37-473d-9f2a-a67c75e2fe14.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 0x4489d9a09f8985cc5af38dc0278f3b0197070cb40a112dc806c536c03ac60718. 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/IL7532212755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0090ff8789d5377c3af1dddba4bb6038c56c0bffec14095dbb8d7b32b8530419. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/IL7532212756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ac0258c39bd9f50a6f103d4b6e0ef846a6952c1052a74c2bc369a8cba1ac4c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/IL7532212668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a1f824824b9eb98def3cb1882188f37361daec70e03309b91ad9bd025477024. 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/IL7532212757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9903c652b5c01cb72770290976393d6fa70f0cb597866b024c0cc09c09da9972. 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/IL7532212758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861f8b95c18c6d4f3781d61c34bd031d52e303b09cd0e5ab5849925bab5dbf1f. 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/IL7532212759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9926d5cfcb865d726350218b94781f4593b64612a4820b8828f88f80094ded. 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/IL7532212722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a867937454f4da692e673fd8879d06fe5cf9b09da12669ae5d986d25806406. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/IL7532212760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa434cc02954172b28146bee7c1725d55e63fd817973373451da6ad9a66da7f64. 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/IL7532212761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfde56a2e7276169b8a098e3e2ed6b95bf28b3cf2bb74d875112dc13ff54455. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/IL7532212762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5493036c1eae99edb9dca95c944439a7fc32a03d5ee4bb165a2124c8b5eac6. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/IL1021910906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1fd808ef76c07fe5ceb70c5b323d58747130dd9828c2547529550a4481be0a. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/IL1021910907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31e40996528b5b4f7de776afc6aea4b5ce526914632a51fcb9a6cd871009f16. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/IL1021910908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c05175d46246d6dc929b971b5e8b2be38f7386c5eb373add016e15b6a34c34. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/IL1021910909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x739b9da458a4f64a592d2909ef2fcf94c36287b46b25d956d1a99c60388d4e4e. 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/IL1021910910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ffa4b11f295494b801189e890ae945396d99e2f6f8506ec13ead6f2eddeb761. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/IL1021910917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782564d41f9d5d6bd2791b4a87ab227fadb02b3ceb040f44b255870d3b80d4a0. 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/IL1021910911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4489d9a09f8985cc5af38dc0278f3b0197070cb40a112dc806c536c03ac60718. 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/IL7532212755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d9926d5cfcb865d726350218b94781f4593b64612a4820b8828f88f80094ded. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/IL7532212722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86ac0258c39bd9f50a6f103d4b6e0ef846a6952c1052a74c2bc369a8cba1ac4c. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/IL7532212668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2511698db6de81a2ede0dc42f098d65a7bdaf74c7fdde5152d5f9b47a92a412b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/IL7532313076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0809f9fb7a6bd39fd4e55aad1e3eb74e1a4b633dff6bcc922a84fa1ad97cdfe6. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/IL1022011744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f498e6e5d5fac31c9b3e530827614ed89b605a020700a151fd988169745e47. 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/IL1042004828.