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 0x72bdf9b949b3d5bbe27b7d5bb4936ecf500dc0aaf5f334283ef757a60a09ae9f. 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/989d6a94-1353-4f54-a2a8-d208be00c887.json and https://artists.proofprofile.net/proofs/artist/989d6a94-1353-4f54-a2a8-d208be00c887.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 0x04e84dca3bfd3a073a474fb6e3bda564e324b13e39f40ae79a1e33c18d8d7b4c. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/TCAFJ2149613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e84dca3bfd3a073a474fb6e3bda564e324b13e39f40ae79a1e33c18d8d7b4c. 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/TCAFJ2149613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1535bf00d294daba6003a2832a7b768a56180c7b694d04df5e7be6c2e30bd946. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAFS2107732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03004e7a0d37d105912f33bef938dafd90d8357ad400efb0ca14e275549e4b4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAFU2120052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3386d2d9ee5b251a59b13ea47912b3fcdbacbda8275e6b99547fe51739459ff. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/TCAFZ2248446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76c89fa7370539630253de130c124dca61bfbdddfb002664652510f426a2a6ac. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGE2261921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cd64020c105c958c5cf70a33018a8d059c9a0b0758c9a97cf8832d9d3b1e42. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/TCAGG2234327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4aa59b757326ad191cf06a457af2ac1ac8cd93c5447a4fa00e81863a679f32. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCAHC2356603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4aa59b757326ad191cf06a457af2ac1ac8cd93c5447a4fa00e81863a679f32. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/TCAHC2356603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4da3c80e1028cd7d20227fec30165c13b235a0c980a3539e9b0ccbdd8e8bdb2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAII2415231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59923aae2bcc9bd7aa00b258b1e8b65cf4cd2e80e7782a78f82bf5f2debbfb19. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/QZSYP2531295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ff40f602cbfc769ce5121979ee63a2208deb8da4f9505c36c8854558ebdab92. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QZQAY2508775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943e0ec3ef9d360338266d1b17d7a6d344fe7657c2cebda61b9604d583f334c9. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZQAY2533059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f90e460a9f80696e1ceeb5d0265603303df3e16b08fe21f65e15db3b7108bb. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZQAY2537489.