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 0xddc9ef4319bf25faa1deaa8a096681a72331bbdf146c0e8aade9902bef359ddc. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb771cd0-58e6-43c0-b4f5-4d336b5f50ab.json and https://artists.proofprofile.net/proofs/artist/fb771cd0-58e6-43c0-b4f5-4d336b5f50ab.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 0xe13e010818334e8b82fc683f600ce1aaa8fdaee6c2a88cafa0691f2e9e172ea0. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTBB2338986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e3457d4d075792b277c074405890aff3171caca189078e311ae42f8b085807. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZWFM2324933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc199a9f52fe6d9ec35f10e8888c60d35dc504bca49e4bf82f621b3245d1ede9. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZWFM2326427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e58c9929c022bb187ce50d757bb50caa43da316ddfffb817c7078458314d8b. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZWFM2355270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6fa51395a35d42288f746472eec5f9a0bab1f5da7f2f70cb12cd7453f9bc032. Chain 2 (Bitcoin): anchored in block 958369 (2026-07-17T05:20:29Z), 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/QZHN52449797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x527bbb46c36d15b59491cb1a78a4c4fafd88736f601790a90ea0523846097ed3. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/QZHNC2438099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf5f8285210d76a1a14176ab3893358ac66944e677b3d8574efbeecf9137887. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZK6P2404170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651473946b6925d54120deb5a5d5a83f3048e3873597ac70db074b8a4ad5fc11. 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/QZK6H2436675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c2ab768241af6ed5e50b53d54a5dc7ed83e378dd59370f83c45d5e14ac45f0f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6G2456905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe50b68f8db9166edb0629546d64644e14082a1934b6771fcdaef6f7afa7b6e0. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QZK6G2417714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6fde7185b0e5503154d2a1050dc92ba9c393be51693362b235ec607426ed521. 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/QZK6G2455061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a015ae09860793694220d1a498c02799b01f0e36ffa3450657310844b1f505. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZNWY2489166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa115743b9a996f4206019d27f5a907006b918e688de6c64503df714f9e2ad86f. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/QZRP42335313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4d2a083cb519a6cbee4fca1238dae6aeb75c96ebc7c0f9479a19fa56be6ac36. 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/GXFHP2472403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30987d77ae69ff9a23741c20c9252b4edc50e794bf2909dfcac2abef909fbd08. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GXFHP2447850.