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 0xd05435478f3778073e4c1f76c33132b342a972d774becf4f5d26b39bd9a8c244. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed227c09-56e7-4e53-af96-d2dc93e5222e.json and https://artists.proofprofile.net/proofs/artist/ed227c09-56e7-4e53-af96-d2dc93e5222e.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 0xee85cf3528705d7290020aa64be11249840e15ffb62725c1536d54152ed9cbc9. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBRKQ2595794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa6298fe90a7607429b833ed3217846a47fa979de673dd8d099f3296d993b3b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBRKQ2595797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c6d5c6a710d0ac1de4ef76226b0f5b3236e5d39df29e45205312604f533bbf. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBRKQ2595802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510d130b05ac00d888c2336cd9a90d4965281c6ff35991a36a5a43a9f6f72d97. 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/GBRKQ2595804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ca9a74c9459a2a1b1081c71a13f3ced5982735cb17a6333b997e628282df13. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/GBRKQ2595806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669382c4f20a48d7dec41394944decab025bc327abc4b4ab98445c0e881fc5f3. 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/GBRKQ2595818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4a95b9d620574e8cc193e2378b5f39529a4fff77269d7946263b12bfc25ee4. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTV32522421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37350ec13b1bad687b9110fe4243f6a802e42347dc77b5087b20f6d908ff6ac. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZTV32522430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d0901e8b8dcd258535403013d40c8aef19983c6c20b41c682315b4e7e9d1e4. 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/QZTV32522434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43f2e4bc3482951f52b9ee3c4d1c4457f58efac49f9740cde737d1d65fb76f3. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZTV32522440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce1874ae62c556132292ff40647017a7df69cfc48fed6602242f6813ff6c1a2. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZTV32522443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4768c0f8a3e91198305adfa12d5467c4f22afb88c15ed3e5f54089cb1d3e873b. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZTV32522451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3ea6bec87644fbdc7705fd60f1e066603a9e7581e27555f26cc8a2b8877240. 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/QZTV32522461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86dda94c29de4e41c854a44852d6b1fd99194b2818b21d6d8162d74ce65f659. 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/QZTV32522473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d8df874263940c33d0d368d26bfed086dc8f8334940fea5b1c50894e91846f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTV32522476.