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 0x5f4b703481ec40dfa63ba3c2bc2fdde9bbe5ad3bba209aa6bf90860c81eedf05. 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/7d51136e-5fb8-4ebb-bdfb-4f1f7605eb69.json and https://artists.proofprofile.net/proofs/artist/7d51136e-5fb8-4ebb-bdfb-4f1f7605eb69.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 0xe980179ffa3f80f2c8fbfc80861167cfffc6d3938f095eb44e4195714b3477e7. 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/QZFYZ2221103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754ccadd354671924f91937dc1c364402c0acf49f48bc14c994c3e4447833793. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZDA62251572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a9c00e29ed2230881dd3e717f6fd62c3330720d6771cfec8f96b7c55c58c267. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTB42281612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ff1e6d6180e9d97515aaea885053633ce32468bdec4e53bb740ef21dc40b57. 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/QZES52436884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41f4a4fb435aa1b0ccecb7c0ec24c8b21d76b1b428fea86fc58fc4e03781f1d. 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/QZZ7Q2469630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e2dd2e70e758a4371623d566ee5e8e38ebfd7ea74313cbfbf79b17f96a46ef. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6F2548789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44ec598830a042e47a8d78d99b0f70d4d083e852a2c299c7f8230d1b1a3e080b. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZNWU2561284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5225e290ee22fc5e625377364bbe520a4fd10206aed68d75d1e05921fe07622f. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QT6EA2592448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5528ffbcaad43615a05845f85f8b6f8cb5f20ff9b2bf899daa42d59cca8fe36. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ22284499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc1573e97ad0fadba4f5d0b3d92402b9358dbd15069b6edab4bb5e01b2f520e. 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/QZFYZ2241114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd494fedd3cd49e5895cb95486f8c720fd67767b718e4d012389becaedd4cdc31. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYZ2242142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c1fedfd76a4f94e42c036c0cb4e7a31dc31bddfdd57c2492d49e947e21ddb65. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZTAS2102195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3d7fc319252c2e82192a0755fe4a1d500959a5ef4b324d63917ce6ff3272c63. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNWQ2149804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76af2a2ffbf879107458dcd86fff294b1e76c510ec66646c10126f31c1d2d04f. 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/QZHNB2198100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316ee5d98da494713a31d5600f76900a5ff1690dcbed6f7d81d72759ba18619c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWX2405513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9603bb0efec0e9061678d844cd78c75f81480ca1b74c1f6716af1f7ccfe287f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ESA011520252.