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 0x56e7d8ff97e8e86e237d9259ef9a08bc29c1b56657346e3531cb573e65d33fc8. 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/83bac783-0078-4282-8d6a-1a4f4f765cb5.json and https://artists.proofprofile.net/proofs/artist/83bac783-0078-4282-8d6a-1a4f4f765cb5.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 0xa515b63cbc2d6de8cf0f7c6db9470d7e73924fecc5ffcc1dd344fc8b5c47f5a5. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BCQAL2300028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afb7e80691a6c64a895b5242a3b3bc71ebbb52241c9c6aee3c36a5829a9e1c7. 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/BCQAL2300031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeef8056b50bd3c87c69651e36fab839ba0003d4346394237b497cd92b89802d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/BCQAL2300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7278baf66961a92eb0e0aa16bea8683e33f3f6e462d26e8f26c0fe4883d749d4. 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/BCQAL2200030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb40ce0176923c6f726d5e42bc7e57c395329947c9ce71ca619d7ec070d6ef79. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BCQAL2300029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3659385bdd03bdd5c021fea1b6b32e877da29a5933dc690bba456ec09ac35a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BCQAL2300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439a9a8503fd13bd11c489c4831270e1c1ef5c5580df821e520f021aa9eeb0d3. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BCQAL2300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0f98cbe471d23281b9b582480285f23e22fed68e960b3004665753dd875491. 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/QZNJV2487323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c51c5668dab993d7df52227ca79b70ad157ea542079ab07c462da188cbdebc. 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/QZNJV2460918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbde42ad17dc53d1c9c0c1038300ac12d0ecd7990b4642a1e0b45d185484f5c. 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/BCQAL2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3e5103e51991c9ec357ac4eab481d8995f4d2aa0f2f88703e7e861fd14c59e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ5AB2077750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286d21998c7aae9e0e62deae839f52498b0326bb6834e1531cc5ae39926835b3. 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/BCQAL2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d37d4bcd395d83fb64104b12e850474b12984b5b24a842fe9fc14539094172. 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/BCQAL2100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee45d67df20bf70e1493526ceb2fc241bf9473893429eb7f23f4f75970c8d450. 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/BCQAL2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39041967ec94470dd4c0efc62fa169015387b264bb860711f352e7fe441d294. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZ5AB2044892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d8b118e2d88669a2b5cb35c27b8ed847cff916c3d6023cff41dd9ec42cf034. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BX46W2100054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505086ee66a83712b0c0d18bf350f868577f4a469bd6742729a7359c11aa7450. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BRE2Y1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52fa2bd199c59c634c25ec32e5ce851d75b7ea1dc0ca917d74f3f5f3c05a6b1c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BCQAL2200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79ac812b729da1c12408ec8cf35748e0f234cd9e6f5f29c4d854209650396eca. 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/BCFCX2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072432678c8f6372b62ee509878c9b17034200487c74fa3827e93eecbb30c724. 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/QZW9K2419611.