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 0xd9b61f9cc360e97267e6bf1a064197d7341e1ff97a23a4980844c549e8779b0d. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac369980-3921-4fce-9718-a891d7aa57fc.json and https://artists.proofprofile.net/proofs/artist/ac369980-3921-4fce-9718-a891d7aa57fc.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 0xb89c2fff6433ad6093739b58a82f23004b6dfd8890a0e072383ba96dd39fc611. 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/US4CL1710063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa315d4e6dfa3b536c49ded8499c310dea6ac151869e0989ef9053eb2561063ee. 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/US4CL2010055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a80042d8596ca77c53a8a664aa1c57544b0a863c0773ef4fa197d74b2c5532. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/US4CL2010060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51b084ececb58141d81ff614268ca9d09a1ccab5732ad192840f13315db120f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US4CL2010053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29c79dfadb5211b493c44c0b584ed45779958b71f2215c2f9c132382be8aeb01. 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/US4CL2010056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01ea552b65f0794eb44f9fbc811f14ecb9eea9a38ffb90a9fc6e8ecfcaa86667. 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/US4CL2010059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa315d4e6dfa3b536c49ded8499c310dea6ac151869e0989ef9053eb2561063ee. 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/US4CL2010055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f282e5d51332ecf40ddb9252acd2ed8d429ce30ffb4e1ed553db9d7d756ab4. 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/US4CL2010064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee1cc156960b6988f825b32f5d9b668c50b61bdfb294228288b09f9cc62069b. 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/US4CL2010065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7800083f20a075994a05005339e56cf2458d0610f33e825267187f40ebfe037f. 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/US4CL2510069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654c2a0e91468f85b3f884800eb0467794ee93999ba42d24558120d42b101ea2. 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/GBP6T1700218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27950e4a4189532880c41078e22a286be811f5b1a7fdbe95273f536407966c71. 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/GBP6T1700232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x144fb4659d0239019cd85547f9ba45162b12156cac854f5ed793b14113a0c4fd. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZ5U81800143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57e1cd75a32b713ac9413718df6ab87736741e4ed2b847a289e0fb5d068e78b. 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/USLZJ2206287.