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 0x4017fca5b9b8e550bc580466ed20e89f8d9a5c3e95b769d950ed861583bafd68. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e52ba84-e5dc-4abc-9354-e1db2739c2ff.json and https://artists.proofprofile.net/proofs/artist/1e52ba84-e5dc-4abc-9354-e1db2739c2ff.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 0x3840213ec1582992abfb575c39a5f6a86697381acb50ab1148ba56cafc4a55f7. 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/QZQAY2588875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e93c75b5b12efbd0d257f824579eb61f47f70c85a43f0ecd8699e55aa46ca75. 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/QZQAY2285780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a47d7da0752b2324fa3eafb8faa55ed6da322c1586b5966c212721530a005e9. 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/QZQAY2255400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdbb312d0376cc2934fbb35d374c512eac1e7e0ad6df40452eca2f4cf78f167. 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/QZQAY2274306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c61d5af9fd0db73fa3227fc71a12e5be856fd0ac1bdde35ad0249a45904430. 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/QZQAY2239286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e89836a475210560846173f7d343b2b45dd23682d8fb7737cdaa5b1d395eb0. 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/QZQAY2291074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fe511c1ef84f4d33e418ba97cbcbbaa73f4e98fb6364f9a9c10ea70a9a61c1. 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/QZQAY2204811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8453a65a7797e8f2c8d580f1f76266e1e074ffc205e2be306b9744083ec8cc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZQAY2232777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e93c75b5b12efbd0d257f824579eb61f47f70c85a43f0ecd8699e55aa46ca75. 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/QZQAY2285780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a47d7da0752b2324fa3eafb8faa55ed6da322c1586b5966c212721530a005e9. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/QZQAY2255400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdbb312d0376cc2934fbb35d374c512eac1e7e0ad6df40452eca2f4cf78f167. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZQAY2274306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c61d5af9fd0db73fa3227fc71a12e5be856fd0ac1bdde35ad0249a45904430. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZQAY2239286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e89836a475210560846173f7d343b2b45dd23682d8fb7737cdaa5b1d395eb0. 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/QZQAY2291074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63fe511c1ef84f4d33e418ba97cbcbbaa73f4e98fb6364f9a9c10ea70a9a61c1. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QZQAY2204811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8453a65a7797e8f2c8d580f1f76266e1e074ffc205e2be306b9744083ec8cc. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZQAY2232777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ea66470019d76997ba2bf1b5d034b0fb8c64cf5b32e3d09e4164cb500833f6. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZQAY2217259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d79c1e143f3c7f358e844f2904b98c41e30a5aeac49fada7ec3f1be46cb273. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZQAY2286352.