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 0xff38bba37d5f8601959cde7791c590ecfc36d339768fdfa9ea4b351af976a3eb. Chain 2 (Bitcoin): anchored in block 953701 (2026-06-14T22:16:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/76722feb-452f-4f98-8ab6-d09f6e0c8104.json and https://artists.proofprofile.net/proofs/artist/76722feb-452f-4f98-8ab6-d09f6e0c8104.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 0x6b58ad510d31920a13f1dc9c3c748054c819632aca2d4a20c98672e60b51905b. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/AUGBT2330612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eec47cdc9f5942236d31ef1c6a05e253d7d0da85baa2170243058800df905d5. 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/QZWDD2488583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe691da9d64939ad7c77f2f440cacae87e8c4568621c2c0b1d4522a76c528500f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTRX2565491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc16160b3729d62dd37e4669a7422e91aea960563420f5f72e32c01a7d7da432a. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZTRX2565577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fad3436ba96110e07acd8c9a9245bd8632e5d219e6ea724ef1962bb362bb545. 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/QZTRX2566603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d20674bdf578f42976cb9e381303bcf05ec08913bea9289799ccb655d1294c. 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/QZTRX2568729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bf906db7507f4bc17bd885af4d43e3c66028f0a6bbf7fc6130e2f148eae6ee. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTV32521107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae19c1d00d49e977386c53649acce89579fa6daec449ac97ebba700edf0bdf3. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZTV32521539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8c2a7af9d27db53188d8c80424de5dba4504cf6e642aa60da794dd540c2fee. 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/QZWDD2514385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef802688373ea0e0cfb7d97673f7773291b4d1a57032e3bd95406bd2e7779ad. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTV32595815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf879f71ebf5cdee52bb76c91a1c98626bc736c5acf7166ae9ea651384b8a32cb. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZTV32595796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae095da747446e00b32eb7c43697af81ff586cc5b220b3c59d87dba2a2045a4f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZTV32595807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdadc7525e0522aab613accfb325007684499911aafc568514fa30a02c88978d2. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZWDD2555697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9882dc0847312eeae8d9160b5b0cfcfb5e4cd376baf19b5e4b1f414752bfdcda. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWV32565255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9882dc0847312eeae8d9160b5b0cfcfb5e4cd376baf19b5e4b1f414752bfdcda. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZWV32565255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e83d82b6b2cd3e7e2145b319c025e9a800664bb79ecfd8355ebf5e8c9d4b05. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT62U2559283.