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 0x8eecee1207b60265715ba239015249a34e37f5761d244d088b43ba0544e6034e. 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/574e2b0b-2198-4bc0-b780-409d526f3648.json and https://artists.proofprofile.net/proofs/artist/574e2b0b-2198-4bc0-b780-409d526f3648.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 0x8c06e8dd50eb2f4faf4bcf5b8c658b452adcb3b2fa5c93e046f078bd8990bbd4. 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/QZDA41824635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa692d7a15341dcfa768b659d83144ef0e55faacd76e57e3f2412255c822ace27. 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/QZDA41824636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1c198116ba1d7260c83eb7ed4136e7d840d0c317480c0757c580a3f59ec416. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZDA41824637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ef0775904326ecca35f893cdf9ae276a3047e4fff94c93bc755b4523840a4a. 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/QZDA41824638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052a655d4cada1c4f0465d79db3599b27aedc662ce109947d81bda49066b64ab. 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/QZDA41824639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x169ca2769ac1b9501e0912ee2df7983ad0bb13d2432750a43054eecf951855a3. 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/QZDA41824640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796c8d097553f7380b0d62cba6e588de132dcdd326a3c8f3c8d32e20f55fac23. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZDA41824641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706dce6b4ac3b4810f9a947ae9fb7f7344be91e403630a36b231382ee4334952. 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/QZDA41824642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7c0d247641c489aff711cfab1d70078f6c9ab066dd6c6f69ba2c1c8f9a3b96. 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/QZDA41824644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fbd7ad8234f6a45255ef5cd02aa741b13f222f75c8c92dc15b3585690fd2c9. 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/QZDA41824646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21118a10644f27f8d0e5b13f7f3c9bec2e4b9e12f926784ed7ca9caa719b26a5. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/QZDA41824647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cddfb0f271d256fc17c94517afdb198ab1acd336e5a5670cbe474d1c75f5805. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZDA41824648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01b8722cfb234b09d551650985bc34573549e949b28e96c6729b3db30f06e3c. 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/QZDA41824649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76071cc4c7af8a77a48293e9890a84ce804a4b721d3b150255abb6cd2eea31ab. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZES52253137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8d2d6e13523575d4e7dca30b569de2a28965128355b78c76cc6b1f68fdf2e2. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZES52253139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c299447d3fbc816db9af9cff9bf79d2476d572196d0741b4cc06f6eca70927c. 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/QZES52253140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0c41f65570c9e78a72dcacb303e8008ea9b7e6a5aa5eb5d739e5b0ea1d0ecc. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZES52253141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x594fb0889cebb7ded4a154e873adf5f94f81778b1f8681910f6d2a7b90d84d29. 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/QZES52253144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490f549505a82521cc7b1425f03d69affe75cf046d24fb6a40df06976626b444. 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/QZES52253147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ca359dd1f827ff335f3f7d1c3890f7edb5f23d0550e6d7ad99ccba6d05dffe. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZES52253148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d84d04391e569d4791a3299086daf85127ceda6cc25698b55ab04288943f680. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZES52253149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a6a65dd6a724a2f3638ee8d5272e27ca35783518f70ef96ed11eb1786dd947. 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/QZTBB2219586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdfcbea8f6a145c6c241710d9db02a1a74d425247b070f8697514df963fb9b8. 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/QT3F32536349.