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 0x9e2fe4327929ccdcb8fa88eb92c6feec90e0d44a13ca154c7491338e2e814075. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7304657-a410-42bc-961b-1f299ab5a4b3.json and https://artists.proofprofile.net/proofs/artist/f7304657-a410-42bc-961b-1f299ab5a4b3.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 0xc74625d155ba813ce94f71c139c49b8bdcc65f1b59d518b63462c2eb16c76f3e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEYOK1725614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5f30709d95d5fd98e494596235d3a9a0d53dbf792a86dd9464c13c9a854fd2. 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/SEYOK1725615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97bff5eb2aa2d592c9d57b4f1d312c5bb4f6d53656bac43cec644fc27b8bb488. 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/SEYOK1725616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f816eacefc8d752f4745b67ccc65f20fefabc02f87dc0fc5143708d46a6b3cb. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEYOK1725617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e82a9f99a86dc42f6692cd24ab4db0954ad805f4190368a7f1cedbf917420c7. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/SEYOK1725618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fae216015315caadb1d833032defdbbd9c8f057608371b441626aa66f6ba13. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/SEYOK1725619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fbc8492881ba71f7db8a25ecafea0772756077a92927972f9812990bca3409. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1725620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c53927f428cd43fda9ccae616dc1fc50a613aa6b6bd159cb5c5ef7e46dc141e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/SEYOK1725621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe76fdf74c598e41f0d40b202427e7c4a087c0d0b6f12d8f3b85f1141f9e888f. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SEYOK1725622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7492f696cde7f58a22e9a9159391c2dc173dd0dd748c447f5333cb4da74d4a12. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEZ651208127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84a1579f64c6ea1e6bdc6a81544501e13556a71ac9370e408127555337e240c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEZ651208128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4592ffd435078c15da1666423b53474c48fbf0f5e9ce8b81aefc76bd54ed303. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEZ651208129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cac0367cd98a27832754eed414c398e6991ec5d35150b6edad0a0cb4688c94c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEZ651208133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b473d7cefe936a38ade72b0b4a732d4d3eeeab487c4af4c13762d26123f3c1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEZ651208135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee593ef1a4614f6ee1f36018aeb9c33bd17b2246b76584e4cd4585a9fd61c79. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/DEZ651319611.