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 0xc9fcd6d3e107b73a3c3bb81923d30fe59818b6e3017d77770a9dde13ebdf4103. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ce1baf2-e06e-46d4-b9a5-5be26a4df2dc.json and https://artists.proofprofile.net/proofs/artist/5ce1baf2-e06e-46d4-b9a5-5be26a4df2dc.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 0xb0c2e4b12b2a9bcb3ac8959ab6fd12d9cc699271f129d32ff6c6242fb925a557. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/CH6542219303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6990cb972fe7407adaa2bf3769fb0b1d1da93e373b9ec5517b1517327db6a272. 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/QM4TX2260562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c2e4b12b2a9bcb3ac8959ab6fd12d9cc699271f129d32ff6c6242fb925a557. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/CH6542219303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc346ecfa6f3f5e064a2e691d9d698bb88c626f3cdd1d2910bc4d5192462f0327. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/FRX282192838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb373cab0502bf8659501bdd21bcdc063fa9c8604411a391abd586102be6ce09. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FRS182110729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8f4a6ef6db154ae203cbe867f01250365b6c330ab2f4b66f0613b132fe6afa. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FR10S2193911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f182b1d7074b0dd96394708772a3bf71f011979c2b38068d6691139c52e881b. 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/TCAFG2049871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b8dea8c25a47d5703ad17ac931314c053dab7506ccb2229c5b9d1f33f294d02. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAFG2049923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8f4a6ef6db154ae203cbe867f01250365b6c330ab2f4b66f0613b132fe6afa. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/FR10S2193911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9668bf30818189d451da921ba54df4d6dfc672f3719de88af66116dcf14c38. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CH6542253037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed55357c6e963932b74328c14198656f1997bd12c2e3b442307abaea95b26ab. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/TCAGU2377655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff2e1e41311d2d61932cea27e444de42c8d0d9e305dec7f6dd62d43fe592ebd. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/FRX762175934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb373cab0502bf8659501bdd21bcdc063fa9c8604411a391abd586102be6ce09. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/FRS182110729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc346ecfa6f3f5e064a2e691d9d698bb88c626f3cdd1d2910bc4d5192462f0327. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/FRX282192838.