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 0x19a042fbe5ff04e2d2fbbbed665c87d821a84c02bb586d5312a061c2c8bbbd25. 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/555e1ca3-febb-4afa-9134-bca2297a43c7.json and https://artists.proofprofile.net/proofs/artist/555e1ca3-febb-4afa-9134-bca2297a43c7.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 0xdc0af9800a76c1a13bf523d241a1665a90f4e14e0525fe12500d3a7a360dafe3. 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/QZTLA2475615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb328746571e0af3cd601c4cf8d8b427c9dfa0365ccbeab5418d2173c4aa0f160. 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/QZTLA2425272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf3289abada6b759e9252802be820e7500bd1dd11c80937df1a48789998c364. 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/QZTLA2410584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55229a08e3af4d05e66b2e40e16c018af75a40511aad0c0b2719277d62b7fd4c. 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/QZTLA2424213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5207352470f9fc686ecbafbe3888844f433414acbad20c299db8e285bce7ad2. 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/QZTLA2497901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2a358c04b135852bd89a6c05f4658a6a21dea99dd7ea00a380d1768f5b8270. 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/QZTLA2407208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35da628342ce8b320cb0b39d149700f7ab0d62149d9a72f03a992b4a04a8ef7e. 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/QZTLA2480925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda63b7949ff37fec0c6fdba30fc7b2f3e91e586257a25f22f2b2362f7678fc46. 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/QZNWX2235802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7b0c8b061d00e7f6eb8836526a24a007a36c1e19f06f3c920a523bccc0a8e0. 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/QZNWX2235803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0b9393f13aa7085c4151edd88cc9fd5f5b9f69c5332df2999c3d6ec7f46d51. 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/QZNWX2235804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900363ec53815216ed1ffda4137a0a6d94fb7962f983e5c5283186ce94202e54. 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/SEYOK2410798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58839a621e67beeadc54b131d140b18e88e340bd6697aa5933bfb0b0b077a768. 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/SEYOK2412157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9415e5738ea7b073ff5984f96621343872ba8dac24310df6dceecc4f8db7d88. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:52:32Z), 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/SEYOK2412160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f95cc5f578768f89b2385ecb05ee0cae7b92fb899ac579b42a0a5a744556fd6. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZWFS2456729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x750461b8386325fa14cb5676e0def2a941d038bf9e694d2d378fa1c848d6edf0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES92511324.