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 0x60a632c5275fa8faf875044302a04bc2640f837bb39ce1082a0ac584648dc67f. 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/658901ac-8904-49d6-acb3-b5e3cd717e15.json and https://artists.proofprofile.net/proofs/artist/658901ac-8904-49d6-acb3-b5e3cd717e15.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 0xecaef7cfd563088a9483d0be60075c6ff189112ef74544d95e90a13e8163abe0. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZK6M2286395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39260206cd97cbcebc4b142a558827428829b8831a3feff500a2e979e359c127. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWQ2336730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b662767cbb40653908966c647a82b05704c88b71cfddc8dbdaf20135f41db39. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTAS2393120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5e792b8bfe87575460a641e355c640c6a28da281bbc0c731fa314eac2931cd. 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/QZTBC2329760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f3080797e809a7986ef666727aabb243ca24621687e353b870c66258ea97e3. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/QZFYY2435148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d651e960281fbf27312e4812aed306252de2d5b593ae30188448bace3daa78a. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHN72430808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c507848e0ec63cc7f34dc398d5da91a893555779f4896689330810e40e3d546. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6N2483654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c94e7719dff96ddff87528f9e109aae0c5fd8cb57edb6cdcdfbf12d610d6564. 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/QZNWQ2479626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f4b452ae19a28ac1cf3fc9ffa4a6924ace1989d238480391ee91ac4e3da36a. 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/QZNWQ2479627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a1e80cac22b7e3e7c6ae6d07cedebe5f415d70e2e71b1c1ef373994b4273c3. 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/QZMEQ2495014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c672787708ef53e62eb0d51e640d5306d9815c5b4ef007fe5436d7d4605442. 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/QZNWQ2479628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d355cf9524e1bd8dbfb19c0c9031021432ca815a6cb7f77855c0a91498881a. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWQ2479629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55872709534ae3520482928185781e48d76207adbbaca841e1ce1fe46ca1072. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWQ2479630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafd11b55d188f560412790499f71d4eae1671188413a93245f2d6cf74f0cbd96. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:18:45Z), 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/QZNWQ2479631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc60c375f060003d3f69e032eb8388f9ea947d29bdc5585e965a9dd81cada2c62. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T11:54:43Z), 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/QT3EX2467949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16240eb9be208ed60029c9ba3f40fff95647ae6c054b5dc3d84b9de50c10c84. 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/QZK6H2511269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0deee8afd95c3d145963085a551b51abb87a03f4771eb77b0373240b90919397. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ782589734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818c6e43751a077003c62f3297107cdec2732307bbc4a167a33f3b0bf73f7968. 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/QZPLR2209991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb905cbe7ed366a1d2ffdc817c39186d29801fda12301bd230ae33d6dcb75065c. 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/QZNWY2304750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd23dc94ed327d1ca3fb81f7c8aa0bd5a79a0e95b7f1fbd589d6d6fff86a074a. 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/QZNWY2304755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1105c93532266a1c69a81f03d5a94afd761dc51ba2cae049df1ac02dd1f471a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNWY2304763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0acdbb93ca965d55ca7a6805df4455ab6611d27799d5422ea58709fb094aae70. 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/QZKDK2182453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde66ad8cbd59c3c2c3c2681e1e323679d8885af0a1f5b7b6d29e41bb0c840e27. 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/QM42K2141862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cae0d6519b576c4600c865cc8ee9221459d5203dfe7d9095e52c3b61c17bd7b. 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/QM42K2061715.