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 0xd0831426ba2ede5e611034146d4f7d1b1d57fac420d8a857bd6b05143873e8cd. 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/eb279f6f-c178-4023-940f-ec18e9e7923b.json and https://artists.proofprofile.net/proofs/artist/eb279f6f-c178-4023-940f-ec18e9e7923b.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 0xc307260a32ad399422301b2d21e2f2baffd44368d96049c11650310d2bc8d3aa. 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/SEYHU0800201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9efeb56afec22b9ac9b2f2fd6f2b16f18cf6567a561a55530c62792fe553f0d1. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/SEYHU0800204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e33ef4ece59075dc147573e0af81dc6970693b0d73dc8c8abfb7dd0ba8dfbfb. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/SEYHU0800209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47711571a404d2597e0fa577235a0d7aa69d0473698f1458310095279168076. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/SEYHU0800210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a85947cc64c50f181342ac8e5bcc882ab35e7e59b18b9bc37983078f3260be. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/SEYHU0800215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad72cc07fedde8187c5c6a20f097871b53f6c704adc5a6430f266c7cd465686d. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/SEVSZ1402101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52501c16365832e1e83b592e87aa3ded1c1aa012b59e154da3621d3d5a0274d0. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/SEVSZ1402103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85c192a78282f2dd90a78c6f921d9d46df6bafd259185d556b30003d34e8f8e. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/SEVSZ1402105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b42701f9d6869dcddfeadb08ceb15c19dfe401dd571cfea6dc50a987dfbdf3a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/SEVSZ1402106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x023eb2bff6c850239b62e5eebdd5a1b522a9076ae6525b3a5a5df2c2db4a0547. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEVSZ1402107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6fd40b608e75a488b50008a25e82f9ce0bb6b9b8add204801bcd8a3555c546. 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/SEVSZ1402110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd280abbca27d1a799b1f56f0b081f0aced07a7d08a84be25f6cec4598ddff937. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/SEVSZ1402111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45f07463df5769b876411d19712b597fbfa1da09bf99918c501c66569af4c9e. 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/SEVSZ1701002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782cb64de68f81e2cf17cefcefd0842ae770c4cf95b94341d508bd803bce19e1. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/SEVSZ1701004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dcdacb59558d28e767fefc5178a6cd077930bd9d8bbd42e169654cc1008ec5. 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/SEVSZ1701012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadee9c5f8599650f306784c93b7809927c3c24b10761962001c2ffdc9083295. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SEVSZ1803601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3de30068dc609f7bdce8cb9a4c80836a3e48f495da49b0f0f23b52c8b65cee9. 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/SEVSZ1901101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224361753906223521537a57ce01a0f6695892f4f5aeac29f43b34edfc66ff10. 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/SEVSZ1901103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861754933409470263e70a3ea86bcbc84be35ba47b20d29ad320b05cdbc12733. 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/SEVSZ1402108.