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 0xde7e2856ba536f00e44102c83847866aaffc010f32d208b98b61afdd5e4f1b76. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1fffcb30-5346-49e7-9a2a-6d025840d90b.json and https://artists.proofprofile.net/proofs/artist/1fffcb30-5346-49e7-9a2a-6d025840d90b.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 0xa86386e81ce8c29af9241905d39a4632140e8e0059d7eeab694519da8a0426ea. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QT4K32503805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x609f9ad9549da4dd8caca1a3f3f8c423e12ecbec0ddc5b2581dd19400a438d37. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZTPX2399417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca84ba5a0116ef5405b835f1a2e2b570cc21a21e4b4acf8d83e645c90f4a1aa7. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZW9K2396816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae880592f068564f834a6e49e77b36f585e187f1c5347a3cefc2917f5b07cd1. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZW9K2396817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9936965cef09461758a3e090a7b75a2e21111de3c2712d3595193febeb76c6e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZW9K2396818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b390ed606ed2a36c7943813dd9c9bbd9281a4488f9dfa24313f8f67940a7c3f. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZW9K2396821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955a39103e370dc20b63ddb4b6dbfab00f46e75225577af496ea0c80f471cf85. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZW9K2396819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd114440ee0b5629a19703ed63a73bed77470614d827e80f7702853390eb437. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZW9K2396822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffd9426d39f458df874a0151fb7f7c97bccb8aa5af783acd940d2cc75c93cd4c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZW9K2396820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4aadfdac147017356eddd48ca7cd3449d2488d533d3f0564c48afc0fef2a7c. 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/QZGLS2401781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6c75baed1686ded50e427c13f0996106f71d4e72b7e187bb1510e7a827bf76a. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZGLS2401784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01b30d4caed5de82a42b6692b55d514310c7b392210459ceaafe3a4242b3e8fa. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZGLS2401785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e59d8321fea72ae8a5ff6aebac9fdefdece30c64bb493a09c803d2edd0b1126. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZMZ92494653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe833b0a0fb1fff5b04f3aaa120bb467200ef16dc64b513d691a63e9b604e4f1d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZMZ92494654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf24ca95cd8e8ca5435d73488fbb07cf4c5233cfcddfbde10c6dedea51852cd3. 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/QZMZ92494656.