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 0x9ec065eb3a0c620f41b8bf5a1215a1488b9ff2db25ef2f547a0b86cc341724a8. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4053c4d2-4c23-405e-9465-f303c42d88ca.json and https://artists.proofprofile.net/proofs/artist/4053c4d2-4c23-405e-9465-f303c42d88ca.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 0x47aa85168846a4d12aadfef1925276694ac3de4459c6ad24e82da3e2b242dac2. 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/FIEC22300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae94aaab5d54da06cc474abd9d8d145587ede0e23c520c862eb48d00b98ddae. 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/FIEC22200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6203d2701a7462ec292da92ea9408606f7410c370630182d0ebce18ed2fb250f. 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/FIEC22200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e852d69c7210fdd04bc212ef72b6fde9bd6e74b195901f8337a34a44312bf7. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FIEC22300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ab1e4b8a505bdfed433a75d92d5363974c9de783e0c9dc307fb75fb2afa570. 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/FIEC22300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc09b443198bede77c88aeb39c6af85006f5a0c5ca3eefcc7eb402cdf55945766. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:01:56Z), 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/FIEC22300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10089a8f7f73114622a11b8661583cac015b3437952e382ce7e7139899f75bbc. 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/FIEC22300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac32f844f1fa948df6ad791ecdfaacff8e08bca759b4c6239a1da8b26cc9dc0. 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/FIEC22300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd237caf18cd2e0fe082d5445c920b5d0b72fbd18b55c2ad2a89864bb9a398732. 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/FIEC22300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ab1e4b8a505bdfed433a75d92d5363974c9de783e0c9dc307fb75fb2afa570. 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/FIEC22300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac32f844f1fa948df6ad791ecdfaacff8e08bca759b4c6239a1da8b26cc9dc0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FIEC22300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47aa85168846a4d12aadfef1925276694ac3de4459c6ad24e82da3e2b242dac2. 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/FIEC22300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10089a8f7f73114622a11b8661583cac015b3437952e382ce7e7139899f75bbc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FIEC22300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae94aaab5d54da06cc474abd9d8d145587ede0e23c520c862eb48d00b98ddae. 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/FIEC22200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6203d2701a7462ec292da92ea9408606f7410c370630182d0ebce18ed2fb250f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FIEC22200002.