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 0x9fe16d2bf03bbd7e77f92fda5523e55d90d1fd79b587d35010bfe8f0610fe4fa. 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/db344fe5-de4e-4139-bd83-e961ee71642a.json and https://artists.proofprofile.net/proofs/artist/db344fe5-de4e-4139-bd83-e961ee71642a.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 0x4fb77f059c2ef6b5cb013b687baf33ec8dfdea586ba9f7744ba2da4eb9464db7. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/TWCC32321963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdf3fcb6c1e751ff4ef037f6052e1684b03363784e87f238e10c4f267dd3694. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/TWCC32401066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3498be4c36ea38c9af9771056b129315eb4c2cb47794a447ad45cb4febcdb634. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TWCC32413019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b36b60605594a01a62b1e95fff2231305834aac939368df59aad23cbea71bc2. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/TWCC32321961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bcda14a00e0c4e07865cc8acbb10b72485dcfa603f641c57eb0391d4ec178e. 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/TWCC32322584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe63af95c255d108fb64ebfcb9e838ac40d7fcc64076db859ef4467293046420. 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/TWCC32322585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06200f6605535a64ba39474890ae3cbc48b35eeb94fb7f57382ff2a58bab14b4. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/TWCC32419903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7540738b40326543304a16e16362dc433d06b68265e2d230d5c0c71b0af7d3. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/TWCC32322586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb77f059c2ef6b5cb013b687baf33ec8dfdea586ba9f7744ba2da4eb9464db7. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/TWCC32321963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f0b846c743ab7b286832c52a8ef772ab6e27ff8af6aae6eb3af6f7986e1a0b. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/TWCC32322588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe800ef107fff0d5f75399bca3be766f90b79776ef3201d9cf58f9fcbb6dbd0b7. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/TWCC32322589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcdf3fcb6c1e751ff4ef037f6052e1684b03363784e87f238e10c4f267dd3694. 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/TWCC32401066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c6c991734984ad78328b95e57926741457b047b1f5d42465886761eb7f25e1. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/TWCC32505635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024dabf6e76be6391d821a642029f82d4847299b34b708e1a1369e99b211cad9. 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/TWCC32413892.