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 0xa44a15cc21832ad26c61b42307cda6c727e6645676a3664940650051464998a8. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d98b07a3-1067-45f6-8bc1-b687263c42f8.json and https://artists.proofprofile.net/proofs/artist/d98b07a3-1067-45f6-8bc1-b687263c42f8.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 0xdbe0b0cfb8bf8b2decb87904fb762ca9a23ecaa86add73f4e46b9bc180be47e6. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZMR82200803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392f33067895abcdc327825140219e92f7cf10ecf6761daa5cede54be2463b46. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMR82200802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d39105184c5d6ed8ef38a2966e9aed8360580b08f489f26fd607a3ca3640314. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZMR82200804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4c4f0fc10a8ea549b6922fe680cb189670a846e26b4ae8d398c4bfa5bd3f71. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMR82200805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d69b162cd33b8684557e624a1a76f662a81b719454c42b9de25fb39177c5775. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/QZMR82200806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4da44066351c366e235dd24d064fc44f49036d2eb136c0035529f4be1af6de2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMR82200807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb53995d6b07d575f141a188b0c821c823b3e46233aa49cf7a726b24263aa8aa6. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZMR82200808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6ff5a0d8c1e683078c1753555af9c4f912331c891e2bf7551aafbceb99d64bd. 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/QZMR82200809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9266a1375f9bf5dda2a9d147ce7559840f08c9ce546208f9aa15996f995d5e65. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMR82200810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46460c34accb9054aaa63f78bc8b01b58ae808746ea94f99046ed07dfbec0bf8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMR82200811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a75a5c264ec6c99f9bfa15dd1171f4b719fbb73f8c53ff429a63d0a12d3565. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMR82200812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc868ddf330792e10e851cc921f983d07ebb240efa5893c4e38fa12910a77dd7a. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZMR82200813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc1ac0fa189b44fad088acf65188ed755e78d17b1a7c46403908ef0c919a8a8. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZMR82200814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7dcdf8274e9a4dd17a0d10455aba30b09ce16a7dd7dd9487bb6d900ee7046a. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZMR82200815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcb49847863762ea785ceb3ac6011add4eb796bc1c1bb14a903b9d751eb1ce9. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QZMR82200816.