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 0xa80a3d38185850ec06348a7df08e672f2aed5aa46822a9d97d60b2eab9612cb8. 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/a259e3b7-e81a-4c32-955b-fce02c70b8ee.json and https://artists.proofprofile.net/proofs/artist/a259e3b7-e81a-4c32-955b-fce02c70b8ee.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 0x7942ad53efb64ab7e71365ac496e46cb1b0cbe7b0117a1e02ad3b41d496f2d2b. 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/RSA221701204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x386cc71a4ac1f38b190a9bc32408f65661fe8f94cc4f49322a7fe53e49c24d19. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TCAFK2165250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67964a96ae5e126c356e3f69eb8a8522d0966e98277ee325e39acaddb28f5c95. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCAFK2165281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826bad8a80e5bbc08a7665bc3aefaf5fe9a9068fdeaffafc0096af12723d9469. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/TCAFK2165308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2ceaa2f12d8fdd04fdaf1654b4634024d8ce1bab82b07b50e2eb2a607413b1. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/TCAFK2165346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369bd4a7667ac99a5732251c884fefc5cb58619a830aa0e6dc47cd06e6eb1449. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/TCAFK2165359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6659e1702c9ad58de017980c2eceb0cc0015cdce33e2fe24379bf506eb4d4e9b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCAFK2165370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239c77a0d5ff34ffc81fc01058999d4d5d17e766196b9bd2302ad0fd98d5d098. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/TCAFK2165396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751900ee815ddf403c2d0f1da5ac2de298d3987f6db6a4b3e297131c332d3365. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/RSA221601987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8607bd3f495665bb71abdd36b7395bd9de032f9ea848e81c4e3162d50cdea09d. 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/RSA221601988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6126b371c49423a8cf8692dc13d1799edd7905a650a5d1fbbfa84b1ecf315adf. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/RSA221601989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56496a27979d21d0d5cda24e33b3a4d6ce8e7321c33e6d8bbcc14b6c7e548d8f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/RSA221601991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3e53d871ca7d7ab86c450d1da79d6b7fff010a85a70f02fcd6ac07a4dae959. 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/RSA221601994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8cce2cea59d291491fe4b583758916de1e0cfc1ad56a5b9057892be2c30bd6. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/RSA221601997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf34a0868640dc7e507cb2109ef3fbebfab4bc8aa6b63a1e582aeff3de14c0f31. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/RSA221601999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33db0c52e3f71a57eef0d0f02bf7586367547995fc75162f9a2941d1350b2040. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/RSA221701000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292c243461b0d54033559705b365a209bc6d3d33a3888df12b6798949da8356c. 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/RSA221701001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebfab1c09da79cb16a9f5f980d73794caa4cfdf507515f7b4b38088952342e5. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/RSA221701004.