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 0xda3ad19d2c1bce55fa6fbec6f1f1819a98374ebaca0ae69afb99b19f3b47a275. 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/35c4f849-f2b4-47cb-883e-7490350c1437.json and https://artists.proofprofile.net/proofs/artist/35c4f849-f2b4-47cb-883e-7490350c1437.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 0x7a8e8e7eb606b8403723afb4eab7402909cac6a66de254ad9f4d90cecd276742. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZHNA1906797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17ecb126717648eb3e4fb8f453c6923bf8306afa9c218fdc8edf167f4eea918. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/QZHNA1906798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ab6e1e0fc58a492e9702b24128b607a8a7403b3d74f49107bf7407b54a9644. 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/QZNWQ2006445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78802277673daf7c8ec32db661933f23b1a4b0e16413ef7a4c3085fde3163480. 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/QZFZ22121820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e668e60194a3e74d54ebd798ff403376802f4bc7d72499f04d05c15e6cc6a2. 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/QZHN32157456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e2f059b3ef4d14533d7ccec232efb20516e589c8db9ef6dd6c7138be2c5de0. Chain 2 (Bitcoin): anchored in block 957587 (2026-07-11T16:48:26Z), 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/QZHN52108545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e668e60194a3e74d54ebd798ff403376802f4bc7d72499f04d05c15e6cc6a2. 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/QZHN32157456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5567566fd36881445c2d5aa772b97d1c8e7fda7bc308ac22fcfba806bcf4d020. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QZHN52108549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b95b300411f6f47119c76c2848d8bf3ae32667f9102483e9081be79a2c807e4. 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/QZHN52108550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcfe270c70ede0f2ee14d2eb9bc490c9f7e3d38d549afc1bcc554fabeee5e098. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZHN52108551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1048c89e98903ae643e68f3d914918f64f2aba36739b83421bd76cb2c19b1318. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZES52254371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008f884110d91b23e65c5821c9a1df33d3abeb7b8ed12e272aa3cff60da3d0a5. 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/QZZ7T2417737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008f884110d91b23e65c5821c9a1df33d3abeb7b8ed12e272aa3cff60da3d0a5. 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/QZZ7T2417737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc479cccec80e2c5acf0d11e412e3640cb2169cbce93e068f6e919c96367d0739. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZN882543356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76abbe171e2c5bbed2bc4a39a426fd05bb0291eb43d1b029aff1070b7ed0ea7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZN882543361.