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 0xdd1a4094a0bd485cd1937e5913300128e8a6e2d0cc34239668e56a6e33a3513e. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55d472ea-0007-48f1-b636-4ce1292f9550.json and https://artists.proofprofile.net/proofs/artist/55d472ea-0007-48f1-b636-4ce1292f9550.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 0xc176e69452826d4fe35b08c519eaae08b0ff2704248aa42a80aff2be61babcfc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TR0650701207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5166f57ec64d17778ef6e4607a48702e76ebdd8e3754203d39f9a5a47efd9b. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TR0650701208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e42da027d2b5324b0e19fc3a80f69829773717b519c82868292bd6de027b56. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/TR0650701211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c342b960f980cfce031dbb568dddc7322d63285c1eb113fae8f70b638063306. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TR0650701216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e7b395d03413e83a73b9d4f77bba7a1439613375f1eab30070bcaa97fcd8546. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/TR0650701217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeefa53e48ceb15aa6f32315f08fa11a24a6814773a1292c3d4cb9babc8a2cfe. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TR0651203066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe179f49a62931f6bc3bb86848408d92418028d552f0446a6eb48800c49310fe4. Chain 2 (Bitcoin): anchored in block 958691 (2026-07-19T07:19:31Z), 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/TR0651203067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba3ac6e72c9ae769bde6554a5f7b712230c7533a01262e440a1232815b25b16. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TR0651203068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa5ed74463bf541c249b47917d83a4e3f8740ae3d299d77df8f899a164fe3f2. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/TR0651203073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a5708f70eb965438cac4f26ed77dce78adcbabb5c41f8ab3418640575e3622. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TRARD1500288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3583d5ef31aa35bd936c98ac0b1ad065f3a5ea28b2e0e635d61a9d7b3f7f40. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TRARD1500289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc271f1ee854371b0d5001a52f7f41c1f48b0e2f349c3bca345f3837c38546368. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/TRARD1500290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ac4ce2191f67721624266c128b5e19c881f4926e534bac3e3f62a103f79c9e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TRARD1500291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064c64ca5ac2cee161be5ac184306f90bb24f18d7f9816bfc3c201368aca15d8. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZTAY2398745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e85799d7302054d91924761bb28f0f46a0b78592c4176017d544d70339b749. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZTB92366649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec43caf2fb65c04d5521c1d48aa64b90dffecc27429b96af87cef56ffc741f67. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHN82431872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7e1dc18f1c5cd2cc5b5e45abfd1311eee504e63e037406cc8bcb3dc1a401c7. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZMEM2425539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb620a54357f2be343a8dd7bac4fbdb873e645ad225fe413726646df9a37b042. 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/QZDA72567829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc6c7701ad62cf6cd144fc78586039c5a3bb217e1614be2e99bb1e01465b56b. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZMER2543403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cef6410bdcf43d082af62591086195648db077f5747e0fa714478afb4e5148. 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/TRARD2000078.