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 0xe9613d98ce0ada265dfdfdec81c37722c82af2ec51c0c41809729d2f48792d1c. 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/a4fcc51a-d0a3-4695-817c-bf1d6591d898.json and https://artists.proofprofile.net/proofs/artist/a4fcc51a-d0a3-4695-817c-bf1d6591d898.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 0x56d84563f34df0c5f4e3df21528b2090f67a2b03fdef7a307d4d42868d46c4c7. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZK6M2128319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193a27dbfe31e139fdb63c6c34e438c412ddef95b470278d46143f6abbef3afe. 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/QMFME2375150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x240c651004cd83b2f8df68f782b4db290da1f244efe2716127d73f5f7fdd1633. 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/QMFME2375151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911a4772df76a2f1bfd7a48530ba2610eeba2a8a75475dda386aab907aa48038. 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/QMFME2375152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dd939b8ae248dddaa4e71af514c7a4837b9a3d8cc28c270dc457de0f03bc94f. 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/QMFME2375153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1e2da32657e7d9ce382f767b2b5a633716fc7e4f95bca5d002f85908c4e013. 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/QMFME2375154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a81448bb05fbcbe2e50301491b3d8e6675aeb1fca7f4ef7740666d63b9363a. 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/QMFME2375157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe35ec970c7b67e65878f090a82c1c281dfb508a624985f657b08baf93c7ecb61. 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/QMFME2375159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28466eef1573191e2599e200b39595e60b008f6a5404f8342eae55ef1a80845f. 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/QM4TW2580942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b3be89e371ebc17b806ef487a0a50cf22d79305f46dbe42fad1a3630919880. 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/QM4TW2580930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f1d7764fa12b7dc9a6e10d36fb4c716512a39c0043717dbbd563ce21659254f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QM4TW2580948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb69ddb4b981dcd204dbd366bc7192bfcfeae4f51b99ed68a485b90dc7dfb14. 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/USLD91754014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b7da67dc72b729055d79bb7f4689f2cb667c2625c8faa252ac59b0f0eac1e5. 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/USLD91754015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe314e9964278387dcd39d4593df6dc3ebb07da3bb998c94aad4949b65afb952. 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/USLD91754016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b10046a58131faa864a6c5b0e3a1ebcc92e96d80cc8bed9d60f54080760914. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USLD91754017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f01b2b368ba7819d06c341ce98ea8f607c60ec15aea2242d5ca540bb81ca32. 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/USLD91754018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e870c404c7bb93cd21d849fae05292a48737f19759fbeb76951079a5e7db9e4. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZNWY2347072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87b58a62168524c8b03fdcdab758dd3e85ce9a808d1a7eaeda57b42a060bc3e. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZWFX2452332.