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 0x171f333a93831adfeb4fc1d490d6f0ee658633a9be01fa1bbd2b8582627fcca5. 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/a80c1699-539c-437f-bc63-72257d7ee0b3.json and https://artists.proofprofile.net/proofs/artist/a80c1699-539c-437f-bc63-72257d7ee0b3.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 0x197b89862e8e5f873781074d27bd23b3fec6287a9af5464902ebe8cb363bd256. 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/USUM72019997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758be0452c961167a6c62b2874a7fe003fcb68c13706692b3bdec8b2c59bfee3. 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/USUM72023502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a3b5469156ffa3e305dbbf75f1b89b2c12a26dea441cf12355deb087bdf4749. 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/USA2P2111217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa450175e0232a9624495fd761a24bd2605b4c012d176368e4f0023b3083e785e. 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/USA2P2111219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf536d2d7b8f7c6b1ff8d0b82eca2af97cac8dc221a81dd970e9202df80130de3. 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/USA2P2111216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfbeaedfa8cd474f7a013f8a1658b7ca76ddea79062d34c8f51860545ba350e. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USA2P2111218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888128400063e9fd3ff2e76a282daedb57bb45b76b51102976e0ae38028fe1f8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA2P2111209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d8047ff163946a2bc2eb2977edeeec5b2164dd82e962d0c1073c001713c6238. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/USUM72116438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959b8e7e46aaae3f45594a72b79e82beeb51a20fc0abe13fb0665d9584fc5fa2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CH7811105528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad5455c9b219b8998cc563de4483bbe30f7d07aac7f18e5ae4da5f078fb7ebb. 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/CH7811105981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e867c83d752d36213d1ac8dae7dfb00c7133bdf0c49436bfce8bbcc2f10eba. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/CH7811105985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e3dd6793e1431c91efc7807aa8448fe0d99fa123ab14e3442243ef38b19691. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:07:29Z), 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/CH7811105975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70b3324f984fea5487d6ffc87b2de569e18e5e3d463939095a87b0625568ec4. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CH7811105978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad5455c9b219b8998cc563de4483bbe30f7d07aac7f18e5ae4da5f078fb7ebb. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:10:35Z), 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/CH7811105981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f448ae19dab7d03594b9ccd4b42909f562d31b6f54f2979aa9628e3ff96353. 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/CH7811105983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e867c83d752d36213d1ac8dae7dfb00c7133bdf0c49436bfce8bbcc2f10eba. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/CH7811105985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3a6ad0313c95c40eee63def1b0591f23138f2d4db4da7bdb9e0c5b0bf5f21c. 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/QZRD92201558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d40e44498080e2513e12e3b23d4b95ed026301f68eac66fb7727a9aa56528b. 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/CH7811106764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb851fdc47c87421089caa9b000fe78801a41b20c5c8fbf2d7906eac813e8dc86. 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/ZZOPM2003629.