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 0x178b7b9c17cf6c7212b7782833417daf27d0ff75dee4d7d1196a2a4887823a08. 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/95d82859-032a-4288-a539-c1d813417f51.json and https://artists.proofprofile.net/proofs/artist/95d82859-032a-4288-a539-c1d813417f51.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 0x601e9501dbc5f86b74ef36ea9b3a90370771f9d99c8c667ac95fc54a50275bb0. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/BRACT1601077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b787d9cf92e0d0f155c6b4f44f532042806f7f5e8c9d0605e100c5f9ca1a9f2. 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/BRN511000024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595f2ddeac746837a687bd2350c766aff85784f14b4b5bd4af9603c33514667c. 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/BRMKW2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac45bcebece0675df496d606144d41c711ad9eea445665c3f2c7ef94c34d95d4. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/BXETH2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9547ab842d3ff371d5ab9bb1112d17931563f065a75a634a5ecc5c7c262c4a94. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/BXETH2400034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341e56f6530672da3738e8ad64f85b63ec9bbc464b15b3e83799da26a87e5f90. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/BXETH2400044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f072c635ffc464a2d3b4129d7e14dbc0be64e76bfd4c89bba3490d54e4e204. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/BXETH2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a8b72ed2d2333475813ed59aea9ef48645203321f995854ddbeba36f800db94. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/BXETH2500027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35fed68ae505faa1e525f83c18279a858eab480a68760b329f4d356c6eecc2e. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/BXETH2500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f6a239c194a4fce9b0a1d995e64912ccd191aa996e2cfea220d315d1f84bc15. 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/BRACT0500548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b9edbb58e9812e3fa18b0b21df3c589d9acbe9ddcaeae4da242df4faf0dfd4. 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/BRQIZ1410215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755c1ea1629163f89ed72d6dc6a37843a8ff05add44603dc33f9622a1a9cd33e. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/BRJPA2100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4294c1e952a797c709eac2ef623e6a951689cc944a1908145ce4b6295e2c24c5. 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/US7VG2432016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158b66cba7f8c6093f7166392d8091537bf6e55ab572adaa7eb53f32a2a831cb. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/US7VG2007069.