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 0xf577e4ec1e99bf677a250fee0d54836e5f3534531a1dbae4f5701ed39f22c11c. 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/6d31732e-4c3d-4d43-a6cc-55236af627ea.json and https://artists.proofprofile.net/proofs/artist/6d31732e-4c3d-4d43-a6cc-55236af627ea.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 0xcf0ce1b1c0826984fc68b87bfafa7cb586e67f3edd6a4b223f22d358551b30a6. 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/HUA320500056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bae12a336b23cbf1e39a29805fbb9911aa554cb34909304c56631f37a543003. 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/GRL019900071.
I Thessaloniki Sta Rempetika (12 Tragoudia Gia Tin Poli, Tous Kaimous Kai Tis Gynaikes Tis)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8b20d4dfebc9b43134e5d915b0a658d0ea6ce278f2fa9e42b96471fb649e5ef. 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/GRL019800156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd999d87ef093114ab5a6bba5a7e246473b26a2859e2555292c5b380dfe8ff245. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/USA371493309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479b2dba74ec7708c88bfcf626ede1a9ec95e2ea02f65a945afaffedbf8379e3. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/USA371493310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1d21fcbeacf75a026b5e6bd5dd46802e7ee73366ec53faef99ed364d8aca11a. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USA371493313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f00dcdec2752c18e0d4a0a968c7c1276830b4db9e74bbd9fda63f60a1ddbba9. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/USA371493318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a7821feb3d172b1906ab41e7fc2beff7ed0c6361298bd84203c7ec2b0feb94. 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/HUB741968208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852a789f494f8851703293a2412987b57493f67b486f408ddd0ccaf28e2786fa. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/HUB741968211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101118d2e97b5b83c21a37d6cdd01c1659650a64baec4f73674b1bf76b1f08a4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/HUB741968212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db37f18d67273fab34c6bb008f9895a5bcb13f6a801430470300982bb859382. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/USF7Y0800063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd227582d71b161de19c0196475f01d4e0b02fe633f345081e71798ff25f75f7b. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HUA611802310.
The Accordion Lifestyle, Vol. 2 (Masters of the Accordion Play Traditional and Popular Songs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d904274fb09a387e87a5a2c8f2fa4ac07697b8dec346aaa5a2b98a5e7fa112. 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/FRY510887132.