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 0xc1e8cdb9bf58e5fa80f454dc876fc14a56eaad79462a72ffc743a8e6c72db616. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/22ca5ae2-a7b2-4478-a907-48c2d4d7b9a7.json and https://artists.proofprofile.net/proofs/artist/22ca5ae2-a7b2-4478-a907-48c2d4d7b9a7.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 0x7bf2f14b3a7818a2b1aabb4fb0988e4675a7fa3111ff2e9785fa285e9a9ee1c1. 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/GBKQU2422879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3d455a34d9a709fcc91d9799c2ff72302bb5cf1d2d7770e65bb59d33315fa3. 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/ITN3C2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8ea16d05fcc1a59335b2823cca7bc59ce7a4dcf5f5e8c226fd11df1036bf134. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/ITN3C2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33e5025cbddec8f1ff97ee4598fa7f814f5971f15147137b30673e734436e9f. 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/ITN3C2000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a104b5660f0e43d3d2916f71c62b3a17acd0957c8601a4fc6ee61febf2eed8a. 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/ITN3C2000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce4a9307b87862b5e46f124aeeb8680a7b1b17a5a0684f0a73534b728b3a456. 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/ITN3C1900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549653a923b39410ee0f3dfabf28001adcdfc8bf23cca9b222d828e26de9d078. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/ITN3C1900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0e8e70ca19f094f36f4db8cfc56cba54367d577967a1a50eb3f171a3bcefdeb. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ITN3C1900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8afbb6d7b3b70f32543cef77c95240792cefb891f6eab52d81bea71159f0297. 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/ITN3C1800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7f45245bd8accbb413ef677679f50ad8955e44761df7b698cc45d7fd5077ff. 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/ITN3C1800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd45c86a1b40380961e94470d7c0465d6c7464c62d327f495c26128b56420d97. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ITN3C1800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6595b83cc176320754fe8171e03504746a5177d77426019491d1e25be42eafb. 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/ITN3C1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fd1239959ef267758833ec90e8b9500a175bc3d7ed54d5e4f929a9df91ec0e. 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/ITN3C1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd949f82e8138bf4c4d7abe80f1e50d39f112d911f8f3cf87e390fb8b18a991a0. 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/ITN3C1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9582f58de0f0817295d4d14d86c5f198e484840f74a8bd41426e691d5f48134. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ITN3C1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717cc5e2260d08207425268288405194faa91f999c15a181a0776fe9811d0b37. 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/ES84B1810163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5360486410017b2b381bb885fa18213fe24dce7302c7d6cfa1bc2582acbf67. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ES84B1810165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c479a6557d0e75d5648a7c0a440558ef5d8dcc7149cc39ba8ddffcd4ea163aa. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/ES84B1810166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244dc900df3e596925c7b2272c7d1d92807a96b2d6ef8429fcfb37cf7586855c. 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/ES84B1810171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9320ff4ae71eaef9bce0f63422c830bd7b391354b65846c33445c09d1abdab7c. 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/UKACT2382196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ed4123a6a384433f9bc8fa30d7d1e671403e3eb01961403c1dfafd79e8be43c. 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/UKACT2382204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafeda425f8e55c46a11637221e771e061f62600f63c02c95a4d93b53c0b27e9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/UKACT2382211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57a44e308d37707f9a08b51a90521ca73ee3b55270187d273d7fe44391414b6. 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/ITN3C2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cb68de4ee729707791cf1b2475bb62d139349e3ff288672e28e5e552547f9c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ITN3C2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e1d1a6c489d553fb6d629539b87c611d1796c40ca976c2c86e3100d4695f7a. 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/UKGGD0600029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25548898d6fa747b96b1a5e429976a3395920f1b56ceef4583f7513414bcc969. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEH741810077.