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 0xc1e1854e2c6a65a7338e231699685ae01df8d713bb17aed196b95b62d89872f2. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43764950-3153-498e-912c-d91aa0ec144e.json and https://artists.proofprofile.net/proofs/artist/43764950-3153-498e-912c-d91aa0ec144e.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 0x2c9374195efa7507d8fa0931b9a1ad1bda4983c435b29be6b8d0fb91a1a8e0a3. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZFYX2542618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f7ab1aea12412ec3037b49b148c88e4e2a2c9f79fb69ef1c0abea3ed5abbf3. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZFYX2542619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0b77b4e83e161b3df9dfebff3093697836249b05fa2ad8a763a132b74d7610. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZFYX2542620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa615f285cc98f2ca70ea38a14c8ab182759bf1cb81b75ba5f170e9005c2bca91. 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/QZFYX2542621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cb410bdadb7668bd3e5d37dc4bab1363050d20487ab8398ab25ceb8ac4b3065. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZFYX2542622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9249431ea43c28420256d794b23c0b22f682b1f38208c0e99cd9692085cb90e5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFYX2542626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b62a581d6c067d393b53a0608fda081c992111b2d2d4dc7b67e30da3f9bdd75. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZFYX2542627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c52b6547718d31767b3b7f9e7f0d28db0f715114f3c2328128f9d44d5f86a4. 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/QZFZ32530188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ed53c636ad69f09e2336137801f7b0ecb355bc68fb09c3d7dac032352ec3ab7. 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/QZFZ32530189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc3eacaddbf1186a92ab8730f13c2c006039964c489eda1c2ce5121ca99d665. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZFZ32530190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1945dbc68f94b848293ca387e9675ee824a16fd5a7efb6504f9d093e4885671f. 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/QZFZ32530191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaff84a54f9d18c1c5515b6830f32bdd82a019523630df63ea6bc1d4f96ca12b3. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZFZ32530192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5925839a2d9754933fe01561eb99188bc705509b1575633bf4a67f54204426e0. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZFZ32530194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86928336466cf78bd79f8a1ce67a7269f82885eb69a6d0656139eb1b391aa81. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ32530195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79aef460881403c24fbf5459f2121b1ec86a48dad5b5593ca58b64ffb68388f5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ32530198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7fdc0747bd508d279d874f4eb591003e02c70efcd8fa89b21e3b5b0238257c. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZFZ32530199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb109dbceb9fee617976389c86c616cbae05ed7c723217396c1fdc844acd63b2. 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/QZFZ32530200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb463fd8d659c633b8b4e21b453f6cc0747af1d7ecf03eebbdac70ae5ca4360d. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZFZ32530201.