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 0x64aebbd81440d4312a04a1313d9a1e3014c0108c760df36afc340525468f7951. 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/8b838b13-bcfa-40de-bd97-670b3f04983a.json and https://artists.proofprofile.net/proofs/artist/8b838b13-bcfa-40de-bd97-670b3f04983a.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 0x24f92ef45623dc668382535b501e490fcab1cfc9d2b4462325ca5a68fd89e5e2. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/ZAC012000365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62144a136266edd0149f7a5b17f2e487a4ca8e4d65cafaab81280b37cb91d9d6. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/ZAC012000366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4f3e2e2f6bf35e7b83fe459dacb21b1491ec42e168e045d6dbdf6aa6344768. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/ZAC012300136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091a2072a814cbc20ca79fc20b5b2e4ebc9fcbe7f64036f99a73aa4d4a601400. 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/ZAC012301391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc40c77c734b67a2df1fdace2bcb8cb61c9ab00ff244ae91fadfa72f703998f. 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/ZAC012301384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076f3dab459859c4ed44b15ee08560b3305d953a738c5e125c84aea049facb71. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZAC012301386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc2c8601b1b815b0497d97e66187e62d8be9a7051e2791df5f966a4d5c62916. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/ZAC012301385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1c2348654cce4d1aafb88f892d3f517b9057edad1f1f6ce92b5503f76e85d8. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/ZAC012301387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f28bdeb0663607c2d6faaf59dbf850b84780dfa93fed709987a507b48729db8. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ZAC012301388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0f011989023bef3e128fe879793a3be293db9fadc4c33266f38db588a3961c. 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/ZAC012301389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4de7e7b65874826472e00ed1d7d1074f4099591ba4c8509da83460432629935. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ZAC012301390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091a2072a814cbc20ca79fc20b5b2e4ebc9fcbe7f64036f99a73aa4d4a601400. 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/ZAC012301391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86aded5a26789f718ee289f5ec9485a6e4ae62fd1fbd3a4a0869976f53bc155. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/ZAC012301392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3251679efaa95372458708f2befc9e6c294c855cc7678d7e69d57042a54f8135. 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/ZAC012301393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6875f3dce9025619593f1273b1a2bb16d385065d697a0c6f984f821ff44ec565. 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/ZAC012301394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a0fee5c40313e2400c0558b4b6bbb0f77eed6b145970b2fef0d324748ae12c. 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/ZAC012301395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54739d8bd7f7965f3b142b45a8a6c77aa1ec103f6155f7480b2ea4b3316ffa91. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ZAC012301396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f24e535439b8a3820de74949d40fb28acda9201df0c9ff38f22aa614772418e. 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/ZAC012301398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72624f836226e508ef344828d2fd788d1100c789ae76cae1cd614cff035e1f75. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ZAC012501193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8eddea8fcad57b87436b81ac3bf57af54833d6a9c0086b324b811bcd82d6c078. 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/ZAC012201592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0968623fc0e399cbd1018df19f4e2aa3b4bc0f0249fb08f9c979daec0e5222a1. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ZAC012201597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54778e470f14f734d7b13c63b535f49ba697244ff31b443fcd6d3ea691602626. 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/ZAC012201370.