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 0x5a294841dd7badbc90109845329c00fb1fc2fef15d0f4367165ea46db14963f4. 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/939ec525-1532-4a6f-88f2-c69d8b0372d3.json and https://artists.proofprofile.net/proofs/artist/939ec525-1532-4a6f-88f2-c69d8b0372d3.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 0xd92d703cff86ab1342ec97a5b894e91f6caae8d0982965d55f0a824bae0cf58d. 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/QZLL92466570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0de2b9ca3afb26e1a862ebb0e716ec6f4289b5360f8ce1c7a5eafc6a5c0106d. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZMEV2482793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd3271d7d74e2b87526a16cb1cbb629fe73d181120cf6d0bc194a3af58d297a. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZNB82426540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e5cf9ce7c6526689351a1da409126c754b36aa80b33fae45b73bd5209dae7b. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZNMT2491215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444f6e3e888b74983edc3e3be2db02291a558efe7f3b77608fe4dd2059204810. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNMT2486533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f62164dbef29c617cdddb66888c81af6417aeb3f3c532766bff27dd80bee83. 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/QZNMU2459162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb374226dc5c24ba0d2d1093c05a1cac82eb7a3ed02909e5e29293208ceb5f8f. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZNMU2463960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x922b752133091e79950aaf0a9a8dfb95f157ac34ae3e3dea4c4bfa642222e85f. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZNMU2470924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b58c97d9582a6a9a5eeef70b829f2aa95d94e31784ac15c37cbdfbcd2becfb3. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZNMU2483848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff44b31ecf2944b736935120fcf095199adcb079e7f4b6f89b5552039dec51e. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZNMU2498854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaaaae5d54a4e86472b93292e345683d7f1a2c224b758316300c0fcac88c8c6b. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZNMU2498853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9df082d17947393fc9bc19cad12cfd4f465a464943e7bf26b8515181a237242. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZNMV2409465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33aa8db2d905ad3dbf67fcfbc1e6f723bf29388de419d26d483e8312bea40f5b. 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/QZNMU2499209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817f6d5f2e7ddf003dde09f9691cc0b26c372cb761cce5a70e4ffa92086008c0. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZNMV2499188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce14f96f8227cd8fff4ab51d3dffc74f2e7a9b8ea0017e7f484a8d17f79415e1. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZNMX2432754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1801d73cf17228904f0475f8cca1098aaa3ead79375e71abdc1f5156a657734d. 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/QZNMY2445967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1568be934110c47c67611ada8a765624f1f17f5a0f098557104a00797ff1b0f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNMY2494880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ff10bed5656860576ab903a8dc40a881d7bb7b51c06666a2f102909dd3342f. 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/QZJG52564775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c71fbe77ce2bd7fefe432ebe31eef02523fd5cbde893341421bacc82afa3c9. 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/QZLL92535016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107a3691f1000b33a9c861b16f4196db00567944ba773e63b0f29ab54ba4c9f7. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/QZLL92533245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b388aa1825df0609e1496aca1cd225c8c992ccc350cf2d4b7b3ca53993a976. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZLL92540316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a6953a5ef325339785b5d33f4f968fc71e72a582ff2df47aeedbcf38c2052a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZMEV2528879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afabecb24837c016947ab83eac5bea1c9e569ee96dcf4926e491586c4bc204c. 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/QZMEV2528875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81cf167b0273a3efb04db105e416725761ac63322585ec975ba14b7bc964ef45. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZNMT2518610.