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 0xbe4b413c8016e02ecb118a5ec004a04fb5cccda216a7a2b21b6462fee045ed05. 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/242113d4-cb7a-4b58-96d5-c94468814bfc.json and https://artists.proofprofile.net/proofs/artist/242113d4-cb7a-4b58-96d5-c94468814bfc.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 0x884d0d28899296e0087c00d7a5d06952d98bc9fb3294022141247a5dabb5b95a. 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/QZRP42437357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedf7885a876edf2c22c4ceb3ce3c3a3ebd752ba347d7440246779217884f846. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZTB52427851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe455a2a03c7393c2fc908de3c05d04ab33141e704b61ed5d498638f474dffe5e. Chain 2 (Bitcoin): anchored in block 959089 (2026-07-22T02:17:57Z), 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/QZWFL2459880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051e600feeebd9175434a2923d19acf83424fe89ff2efc49d09f9b404e3d54e4. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFL2489987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1f8c21c1d9b222fef109567bd81b7805d5f6bf34657de93a9626bb34b2814a. 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/QZWFT2450468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df3f2e22eba1073c172e819166fcf243562e3cbf9ff91cc63d65223c6334bed. 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/QZZ7K2450639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0998dc5bae16f9cdb2d66c43343b27173007b1de79ea0298e41bb12d91977e68. 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/QZZ7K2450641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b2a940cd9325d2c149f09d70643d6702d7af1dc48e168efa963da3b1d176756. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QT3F32426067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52ff6c874b4446dfb19e8100b049910049023573877d5cad4c847a0bde55ce8. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZDA42566028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f541ad6ab589113246c95d7ef1240f48b7d9cdb3f7c6c572260ccc3418c5d1. 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/QZHN62544824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3f8eb29a6e1ec32ec1f482820bdee1367bc8830434a673e6777d5ae46803fd. 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/QZHN62544825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4dffd96be23a8ff693f9b9e43f2a8b04e0015850f8959ac325fd4aed49f35b. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZRP52546357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee87ef3bf9f0d648f45a51ba810976414e3a5299a98115b07c9587200801873. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/QZTAT2512080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee3256412627a0b8f66f3ca969d0126489fdc8b347c5f087e0e7fc8b3ca7cbb. 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/QZTAS2535249.