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 0xbe3829868aa169eb00c9074fb7427ec70e16499f8643313b81b9c6599d2cc2e5. 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/840d058b-82c2-47f2-8c23-6c4239d593ef.json and https://artists.proofprofile.net/proofs/artist/840d058b-82c2-47f2-8c23-6c4239d593ef.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 0x7b9996cb6de7ed2151273a8fa6ba50717aad54680c0f325c52f144b27a0a9de7. 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/NOCMC2402040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251205198a425bc83ead39b4e7bfaf40f9629f1284041a3352e2da4e698cffa2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOCMC2402020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f5f4bdbb741eadb73b83a38de5a36a69cc9343f3ac12405a89ca4ee338c414. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOCMC2402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c16d4c560fc58f28cd3ec384750c98f2cf6934437ff2e154198fc67a700ffa. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NOCMC2406010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a4b146ba6568c13e363230088f7bafd62ecc7a1adbf97c836e94f398dbb523. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOCMC2403010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c343d43b7b714bf6f215bad98db31ac646dd91004536b17a5b9fed3d07eac8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOPAZ0404040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfaa5f9c497c86d71fb9266928939508d64867a93e27ed1d6ccc647dabe56e2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOPAZ0404060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x629937e65f2f64feb3e6da4e7fa96e35c4edf8cd6a3b966f3fc54c6654832dcc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NOPAZ0404070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5983472ebd809911587a1af932b9766fd0166cc3cf27bc31e8d3c97f36dd50c. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NOPAZ0404110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c47b231d8e79df909fa638133ba5f680629169b3e2344f888f48f74abafdc84. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NOPAZ0404120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5dbafef395b69a54399ec5d870264ff4bf70475011207585defd75fb7c05f06. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NOPAZ0404130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cbbc633dab906ab4df797de7842da48c29840630cfe2a19a0cbff27ee2c64f. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/NOPAZ0404160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89df677aabeff31e235d95a6e00f113f6de7162fdd8fc0e8286497e793547da8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOCMC2502040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0c16d4c560fc58f28cd3ec384750c98f2cf6934437ff2e154198fc67a700ffa. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOCMC2406010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d67eb22b0e6b22c9074adc33f05389a190a9ff6f997eab1a603035eb50f10f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NOCMC2502080.