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 0x142629276529cbbc5635c60e8eb033d55e7dabb106d7cd461441ba7bc923085a. 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/70e11f7b-a75d-4ec7-999e-a1be16f2cec6.json and https://artists.proofprofile.net/proofs/artist/70e11f7b-a75d-4ec7-999e-a1be16f2cec6.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 0x817305bff188d29622d77091427da9e75396e29dcfc650a5468e92d5bf6c8462. 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/GBKQU2278428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb244b4159e1f522e741ebb2c8ddcf96ff7b1d6a76d6ff24bf80de9cf52be95a3. 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/GBKQU2360003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660c573b09e9f44a76a098c075a96b7efb62d22547cf423d4e18d8f279fc1f99. 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/GBKQU2360002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4dfce58a976a6bf72a2ef4af86a81cb7f77325ec4552f10474bb8a7c47ac946. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/GBKQU2381021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef770de3417d392c4d68b975358a3033a07b44342a07d99260228639f8e4d5e1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBKQU2476795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf255a01c52ecea6524f4d65cda2e464d65ab70d5099556eb14cd2d2e5ac01800. 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/GBKQU2476794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49c2271c3484b003c24355c3ba5fa32e11ddc958ac0f1ad4dbbc49509fb8f55. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/GBKQU2476804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f888fe553677254424694e52806e6a7e809c3690f999c11b9d6a65e3037f8e. 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/GBLV62407245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4853ba7e97525a7a2e7988e808aaafcc1b2b13e64356ebbff9bede6d64da4e30. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBLV62407246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1432320c8be7f2e0fa9958dd953366592ae63c0a03974c2a23496e2b91cb4e2. 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/GBLV62407247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c618bc78bf86e40554c58a33843b3de78172898df09a10a3fd324b8e7ba1a3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GBLV62407248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba90e772a71aa627c9c1b1d4346909adfcfb2fab70234c15ec97635032797551. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:04:43Z), 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/GBLV62412069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347dfc49034e4e52989796d7f41a00e745d76821fcaa03059c84594ea13eb3e6. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T07:23:50Z), 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/GBKQU2504752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c93e046eb1d7feada8e339b35cee8bb22be5a8b3683e82174348eb8cf5ec206. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/GBKQU2505097.