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 0xeeab6345fa9e1d24545cbca38ce3017dc5c14bfc236a6ad7a84cd110f535e1a3. 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/b2f43da8-3e51-445e-941a-ef1a44def237.json and https://artists.proofprofile.net/proofs/artist/b2f43da8-3e51-445e-941a-ef1a44def237.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 0xf47f58c1a12ac79844ba6341f6446e731c9bb19af31c205e87cf74fc601836e8. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZES82043096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06974efbd3ac54289cb940c45ceb3a47f07524afc138703ee825a4bacb1ef2fa. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWU2040901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfeb1bdf666ce790c36502a234591c4d7d97f09acd3030881861e362ce8c759f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZNWZ2056185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7aa424a524160b2659be96be975f9e30768462508a73355f17a91381d459c70. 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/QZFYX2192195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb412e9481825183a952680bbe49b8f39c06e48529739c8b4f9a0ae3353f18caa. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES72124779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9662c87b8ed0b3b1dad18327b631875e11d6bb24652e304aa582622bacc9f1. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZHN92105353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fef41af78c6baa41821204aa109e3f05c771c8ab7b7f4526ebe5997cfa8a085. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZK6N2121672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce77c62bce8904d9ac74c92ea3a18a45b963ad4eca6f36975f6abbd349e1a5a0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZMER2130847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7052d1151e095e7261bbdeb3a52249982d9e3e4dbd27fd37cb3c8115d045a790. Chain 2 (Bitcoin): anchored in block 957655 (2026-07-12T04:42:44Z), 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/QZNWV2151760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1648a58fd2b37481573e0cd9366d014b3b71cb4a5f8580adf1bd0c7dc88adc72. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ22211645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bf04bb351af24a4eb42428590692e37314352ae6ebde6bcee8c53eedad9ed3. Chain 2 (Bitcoin): anchored in block 957665 (2026-07-12T06:13:49Z), 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/QZFZ22275136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64a7c101b59ae8432928d28d51200fb4c620710cf93d53baac4f1f90615a59c. 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/QZES82235084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f24181c38036efd99a3197b77195ceb6eac334176233b345d9ad06643ed765. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZHN42278380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81834ba9aa2568f125ccef8e7bddd576293d5627f5c74fa0bc99e680edc9395. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZHN92233004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd972ce5f6fe62604c7b270a217929288c385530065f5b8a1c0da12f116ea3ee8. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/QZES92480218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c3468563d1361d2ad9c0f71f288a3b00a7a27f161a0599a7948234677fe878. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZK6M2404012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb604b76fcfa52681ccf1d795299a5785195633dac4de1153200f9a1331a819aa. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTB72532350.