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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057a09bbab2ea029f1bd15dbd3eab7438fd874bc60144612b51e7d8be221692f. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d5cef74-d179-45f1-8f7b-aa85861d5750.json and https://artists.proofprofile.net/proofs/artist/0d5cef74-d179-45f1-8f7b-aa85861d5750.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66d0348d11884007f8cceb8f02add88984d0213e43bac78d5e3f4280b8d7c56. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/TRAPP1400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2f385ba6ce2f7c0ea6c74d6aa3d1ab1f0d2979b07d8d068ca87a3019e81ad31. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TRAPP1400159.
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
Marche Ottomane (Manuscrit Cantemir 209)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccc90d485a3a161fc6920d26f530411baa748ea724219b823fb27a59e22560c. 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/QMDA71379903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8576f88b252d046ba1dea6759fb71b022b470d43229e31c698332d20f3cfc84. 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/QMDA71379907.
Küçüksu’da Gördüm seni / Tanburi Mustafa Çavuş (Ottoman)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97181a195c33e86ce7c23097b491b7854123bfcec15fac568e4e9f882cda68b7. 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/QMDA71379912.
Selfo (Improvisation à la Clarinette) [Albanie et Grèce]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5d2a156540bfab35aa555c5a9d808438c4be4fb1509ee86389ef3b556bad2b. 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/QMDA71379919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244c096a73097a088ae3acc348e9fd14c8587954a96f98cb1fc585766f3ebee9. 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/QMDA71379949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40046c53a0a840618e892fa6fb8d7b84c316d84750dd51b5d23817254d6bf495. 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/QMDA71379937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09dc02b2a24862a52ac5828f6dc57be620ea37c7416edff2c191b42d18c13dbb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QMDA71379904.
Zapjevata sojka ptika (Ramizem) [Bosnie et Turquie]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12e54b80653ede26386109fe8748a367ec8d7282d3dbda96680129d06da1d1ee. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QMDA71379916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98746b6173ee7948f297be6b150c36fccf5cedc9a445b6f441c5060095a7a74. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMDA71379921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56bfe6de4cde04b1f9c17728a70c6fd35232c906e721c5d0bdefcfd266b55428. 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/QMDA71379927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac45b5f93f1fc954856af637ec880fbdb1c4951b661d0c23c01f1b337476011. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/QMDA71379942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee268122fdba2719d5896a6ce77ee9eb9bb10c3f3409237095c00d2458530979. 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/TRANV1400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb01490ad7eb50b835f189226966b2707cd0136eaf29af6edc9bb2baca668e5. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/TRANV1400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d650ba553b06d97f2eb05f4c78edc00dcc8afcaacee369e64b18b16a331449f. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QMDA71379911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44fa685da199b94932cb196c9736ab9fbe7d3a953a52bbcf2a5dfa53045a8d86. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QMDA71379948.