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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 0x67a37bab93f7493831e6a23cbaaf56e0f2c6ebe02d6503bb2ade6f7a5d0aca6f. 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/72aef46c-162f-48bf-b020-ad860b4c37fa.json and https://artists.proofprofile.net/proofs/artist/72aef46c-162f-48bf-b020-ad860b4c37fa.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 0x20c5bf64a3347899512f2d409643c28e4aade5ce4507f63f3e2900d2ccbea33c. 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/DGA092214151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53da8e3ba5ab9fb60b2258bb0ef5c1e50083e97a5608fcac2f80051282a91dc6. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DGA092214152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb0e2e8113bb358cba27bdd62004075bbba24d57b825e04ae2c074cd8f337ac. 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/DGA092214153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df0accc43d099e158c4dce63762fb8d787ad8b81e138987a8ac4f2415e4095a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA092214154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8647448ee715d499cc1bf27db8e11e02322db1d9bde01f9f8b66972df9ce2ebf. 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/DGA092214155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d26294b6b7259e1f20100a059f8afbd86180bc94891f86e00eba332a514165. 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/DGA092214156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff61b75075ee5a2e3161c94b04d6eca68f655c2028f7f981d8de696d65fdd37. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/DGA092214157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db293b009896ae2d81e89c0e80aae6683aed2af6f4973d1d6079440da54802b. 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/DGA092214158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1a378c6368a302157c7cd8f5b0b9b65a2efa4d562d398b5401460e58b680df. 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/DGA092214159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25db2fab51c4aee9388b3f0e4ff8d4a641c9a95ceee7a07d3d42a11dec8abcb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMLNB2300057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b25f94f70712c53e99c9155756d7c226cd21d3198b836d998f4cebf3308f9d0. 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/QMLNB2200019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x459ad6950bf0e088406e621613fd7d4ea2691ff163ac6f3db55fc210bd05d3e7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMLNB1600167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efab50ac3425459c880de65821a05709458fd0a3e9676bb4dedf7b836b88030. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZK6Q2223435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073edb7bb2f4fe8faafcb96756e7a31c59cee7b065d423acccfa428ea4fa3be2. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZK6H2137412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d703ac60a0ea25dbb0bb1ee2c1de944dfb0b13d9281777aa56d48ac56a8b31. 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/QZHNB2121771.