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 0x56ec7af7b0cec835a7e56ec117fc5c23d7a36d01fe618d63131340b830803e36. 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/05275deb-56f4-44c6-9f52-f972137bcf0f.json and https://artists.proofprofile.net/proofs/artist/05275deb-56f4-44c6-9f52-f972137bcf0f.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 0x711d56c67e58bb4a4916c2e11916f5e8b6288b9bf4c27635badcdaa196ef2501. 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/CAGOO1833834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3eeef40d9a3fd29ac8f176b7ec4487faa6a25ee4ee7cad781ffde23b614515. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:33:22Z), 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/CAGOO1833802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c147e302cbee5d2975ed9d1c09cfdbeaf692217b02de5ef2a18f686a2a894f. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/CAGOO1833803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aacc4627477cba1a7ca01a10fc5731b19dccb4b7e31ac4281af5f583b636766. 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/CAGOO1833794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6be17b80874395a8acb2b07c1cd63448bc1b6dce29eda5319f62a681df58806. 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/CACWV1940335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78b853fc90475c2836dcf50c701c22ebc910b46cb21e9baa657c81de8fe1cbc. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/MNA032100121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5273072d73bb2cbf74f85f004654507c929a2a8df9935756a6d103a126fe598f. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/MNA032200249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf268109cb5d397964e2108b3b780a2ce93e63e28c7eb8b59de5057976945d3d5. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/MNA032200287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f712d95aaf767b4de51fb0342dd5881ac90453a142d704f95891b8c27363494. 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/MNA032400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68877e3be7b8618dfe152f08b95f2b7b73fe319e9d8fce5202caddcb194e6e9c. 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/MNA032400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d9b18d19a575a743ab756e0b51052402f357c99d53d95fcf1db013384c66a9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/MNA032400200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac82d33f6c21ad6cb973c409b29f8aa20886bce9160a38e13307eb7bf26135b. 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/MNA032400206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cb6c0d2b1c432ca40d2e480b5f9ee680d28327bc1bc5f94562206865877bd5. 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/MNA032500144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad30f20b1c40f3cdceba476ea530ca4936024b9bec2926844ca157078ad14e3. 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/USCGJ1727607.