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 0x7cc7a46d662a23a82b2e6954e2bdc4e3d337483f798914c536103fe5fde0fd5f. 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/85edf57c-62f8-4034-9d8f-f8a9dfe469b4.json and https://artists.proofprofile.net/proofs/artist/85edf57c-62f8-4034-9d8f-f8a9dfe469b4.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 0xfc6c72a5a49b5894f7300e34b40ae0a5fd87d6fd5bc44a7562bed1cdafb47c3a. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QZNWY2224099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6f7fc6b95797557c122298792148155939a12e8019217e885722e30df680490. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZTAS2286623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a198cb9ecf70b5b5c61afd27d062560726ab1fca41758f6cafa1b5bb3779140. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/QZTAW2271828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30f409a75d9596a8b4993a4eef679837cdf4709f0dc9aeb15672012ab4ca68b2. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/PLC062242799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4efea7e97161ba4fbb0508893416fc1af9364990b6dc4e17a22b451dcf28dc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTB42295669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47c328b946c23385c657234ba516a460d47f9de5ba29029150a68517b8a21b1. 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/PLC062362352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1951ac0257cbb6cd4dd27c32d3ced92c5ed80f657990e731921ff0e085ebc02. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZK6P2352822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb8aa1cb0d43010dd40d8a9610bb305b21e87588419efd52830fb1409dfa02b. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZMEP2350024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f215f9a6daebaee4a274bc0bf4a0d66edf692c1d98575d0a2807ed5a322bd33. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZMEP2350025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fedc00c00c5375f841228ca8a50e3fbb3b7d504e51d6dec8b13bc76f4b6776c. 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/QZMEP2350029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8098b4c084ca89e19fcc0347d6eb15660f6d3e1fbe60dbe6a33e4f42abdee702. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZNWW2343302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c5541bcaaa83997d1f04fbeb59b6143052a3c5fb91a4a9e77452c43d04e974. 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/QZTAS2386810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3ac5eb554e80ed6b0f7fae1cc35dd8392ea9dcb9389e4fd5adeae6628ce740. 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/QZTB32310945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1de0ab36b60ed883ffa2cb318e7ba013eaad19a65b7f00e39ea7c6dd6bb8c57. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHN92499464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b73060bff12ffafc928a8660df019a0712f9d67f03217a86e5f47b8134ccce. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZZ7L2422101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8959d427992e4b74e1aa4dd0a1dc4412395e0d4f61c0a698b8388c61e015ab05. 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/QT3F22498246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb861ad3edfb46798434c23e9d1019f3f9038961a0715af80cbc1f52a92abcf29. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/PLC062503338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccd9dc80d8c48bed3249fe0e6de3024c707330ce178457014415ac08575f6e6b. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/PLC062532099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10447b0e38e4b9fdabd717f188d4dadd2f6e87c35c1cdc4374b17a4a7ce56cf8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QT3FD2519227.