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 0xa4c974b3766703fcf0d7a75b266b5e6f27ac18194939e8466e7406a9df033802. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b18b8ad-9d6a-4dd1-8147-a4b43726f28a.json and https://artists.proofprofile.net/proofs/artist/8b18b8ad-9d6a-4dd1-8147-a4b43726f28a.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 0x33f7721964bfaf725f7641ea41dd2adda742f05ffdc58ae25fa4feffc0492d5e. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/QZFZ22309575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c8fd5860993f6878d56d9199690babb3af02e83be661c7a886a956ffe12246. 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/QZFZ22309578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e227f0e5fbcb2cf65c8897a485e25e649353ba91d8290d9c8c63067f6756c3. 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/QZFZ22309582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97836aa2f592caebb2900ab4965ab5f34cd3659e295c354be686f554e4709db. Chain 2 (Bitcoin): anchored in block 957210 (2026-07-08T18:28:05Z), 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/QZFZ22309583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a0f4ec65721052b7eb0713353c24619bc5c6b8c38c9cf7e8f666aefdf7dba0. 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/QZFZ22309584.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04c4b4858c7fc72d22d92ddcdd81535016693dac9adffa57ddd0cc54d3e7704. 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/QZNWT2542478.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c588c7d9f98a97c0e6469d692b275bba7758177d514411eff67f786093cc6c2. 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/QZHN52551990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1258adba1197eb86b9d14699a9c71d3d48b2f0d52203241b01c3228a7d7b8b55. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZZ7X2448800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7dbe371a68d1f6f0c34b5776a647352dc9e91108f333eb399989c06f34d8d1. 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/QZTAY2423069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be1c00d1bc04a26abdcc0489a6b8367711b688f36a2e3e232175a149f9ef2f2. 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/QZTAY2423071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019132c1acf6602acd3f995ba0024e2358f244d467d5b90cbf4baebf68c62a26. 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/QZTAY2423072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2d3a621b9442ea16915541d31f9585e73e7340f384515515b9e8c008af16fa. 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/QZMEM2455872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b33231f8732589f484ff8708ac6dd15523730c5409cdb04ab7229c92358b7b. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZMEM2455873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40911671a00605c0c7e050088c155c8abda1a8a19b67eb0576b50899e6a29d27. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZMEM2455876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3534e1a9a3c782c892196f0a4c136036568671ae94046a70a5835f4b4b6b7a8. 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/QZMEM2455877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab42a7db4fbd6b59bf1090bee60d33a3212a67747b59fe6bb67c3507601d377. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZWFM2333278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ac3ad23f1498bb8901b1c9ba635278bc835553c534524c64adba19aae861c9. 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/QZTB62357085.