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 0xa107d06c1fc91ab41db2bdeec6a78cf6a12e3c7a32560766956370860c0ee754. Chain 2 (Bitcoin): anchored in block 954017 (2026-06-16T23:38:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/375693d3-7214-4b62-8863-d58c03b7377a.json and https://artists.proofprofile.net/proofs/artist/375693d3-7214-4b62-8863-d58c03b7377a.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 0xe3321819862e364af4ebe4cd06f77cc3b1f4ebecfc6f11993b8b01be4fac79bb. 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/CH6542418701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641ec5649f2096e84394f6951a8a8df9dc877d346cc9a6e0329f0c9a9a7b3fed. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/IT2VM1400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3c6eead86f6278637992f361536b46c7130eece50b8d2f043116cea8972269. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/IT2VM1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda27c3066111207b041004f6cc912831cce0c95550a152a60d0cdbd5f78af389. 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/ITC471720001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7728863a20d29cbf2f5afab76cb5e0caa4c8f7381a53b56bb221abd61d4d70. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/ITC471720002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e64252bc65898aa3fce86e7278df502fb1b78dbaaf1a7b577b1879b3d04cb50. 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/ITC471720003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e18ff78e29fd164be9becbc27b82b0c6deb88534fe9f1490ab4ef15b813d2e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITC471720004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71190c2a79d16d7be956e231743a6b43a94231eca7eb13485dadd9b4becce18. 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/ITC471720005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692d3fdc3c09db796e1e375992a38b919ce0823c7f42847f6bcf3c7318cffb23. 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/ITC471720006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc903478963c6bbced31c63b196a18c83945a47c6c62e60857e6a694df81303c8. 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/ITC471720007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac3ae95840e3a1300d3c9d1bbe7b928c20144765f9a754e08c76ca9b969778d. 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/ITC471720008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2f9b0899acdf09c231ca325d168a6b111544f539732f99efa504765ac78fcc. 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/ITC471720009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab71ee226857a5b8c4c620b320df05a1199f364ae40d64a857b47f40a79fb30. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ITC471720010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27f0a451bc697883e63feea7ad0cab524dada143a7effa86aaaef8d21bb9206. 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/ITC471720011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0302ac3135b2f0a1204fbaff9487341ff6083c9c461b7d1d17427aaf77e61a19. 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/ITC471720012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76f29c0df0974ae7cfef9fed34798dc43074cbe52c90e9068c71c79db20d9b0. 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/ITC471720014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x525d2c0a02c234ee3147f2177ef6817491425fb57c0dd4e6f2d433303b16f145. 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/ITC471720015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abd1f444a14b77563999cd0b36de38b8e1f27c7403891f7fe91079164ece8e5. 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/ITC471720016.