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 0x23f4a3e86108baf7e912f1833d93ed090289045a182d747734cf0cf9f2c79e6d. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45105a3c-7266-42e2-b8d3-a6e694c0039f.json and https://artists.proofprofile.net/proofs/artist/45105a3c-7266-42e2-b8d3-a6e694c0039f.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 0x260930044efbac9b40ac68075f7a1ea415dd975fa214270b317350bb8d35ea94. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:10:10Z), 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/QZHN92005013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90a100d77776cbe290d922a24216319dce6b7d7ffeedcb8d682e32ae66f7fa6. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZNWX2290014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d7e92a5c047a07d50553f80f922c5268f64d9fe798fb3a7e8db84fe219b755. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:45:06Z), 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/QZWDE2225063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4f4c751bff77354147aecf96226870c9e0f0bcb7cf3f8e1d79867ada65e012. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWDD2277870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72ee896e721f13d527a34afab9885d3e7c30fd8f907081ae246036b890cc7dc. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USLZJ2593050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6f3fe5b8ebdfadc880380d92b1ab4dfe755cd3248a5f99ee25e3b8b9b57ab1. 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/GBWUL2534941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe250a0832a370c74a0b1fbb547e5bd44917e2a7d1546c7e0aee3bdc1204c969e. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/GBWUL2540430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908cae1d9e565427200ba94d85da7006d7172988a9f6521b08370dcc64f845b5. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T08:59:41Z), 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/QZTRX2556457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72ee896e721f13d527a34afab9885d3e7c30fd8f907081ae246036b890cc7dc. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USLZJ2593050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e6f3fe5b8ebdfadc880380d92b1ab4dfe755cd3248a5f99ee25e3b8b9b57ab1. 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/GBWUL2534941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697c3cd943507e50aab8710a90847f387dedd8a1aec8657c42927ab44bb3e495. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZTV32567495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee35f4c2600b155826d5ad269064f3a4acb657882e9bce3ad0c8ad323c86fa0d. 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/QZTV32567499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x908cae1d9e565427200ba94d85da7006d7172988a9f6521b08370dcc64f845b5. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:51:17Z), 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/QZTRX2556457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92900411bc9601b53949b0f5bfdb442e0f6051e00659d163f1ce3c8b6d36fb28. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTV32567507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe250a0832a370c74a0b1fbb547e5bd44917e2a7d1546c7e0aee3bdc1204c969e. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:09:56Z), 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/GBWUL2540430.