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 0x07fdfc4a61ca25f50414acefdbc5e958464381d4f932986434cdaccf8c28d1bd. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e6084b00-d707-4b71-bd95-c516586dba89.json and https://artists.proofprofile.net/proofs/artist/e6084b00-d707-4b71-bd95-c516586dba89.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 0xb15cb4f685f3c215dcecf75d404553aa7120d73a63a452039a841883e9f3c862. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SE6I32445439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c5dd69b90c579decf0163df7f56bfd482b6a60e59dfe57d37b25c6c5867155. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/GBKQU2450394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a6bb13cd5edd455e9ffbe8d7662795ed673c3f8327376c06a66d367aef1515. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZMHM2461214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fbc2761995c7c1d6527ae6c983200bca2c0874cbacfa3dafcfee4c46cf7883. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZMHK2257521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7598d7726175a4c08837e10c8aeb1addd8206291876dd558f089bf38ade03e00. 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/QM42K2329559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7fd97e97b801d67e645db8be489a746a310abb1c2e6e98348be3c9a008e0a6. 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/QZS652319668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bda5a5842a6062db9e31bc44acc238b24d77a422caaf09a330369ca8bb9043c. 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/QZS642368442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7419d887112d03a8271ec0fe733f546ffc5aad84a00d0a9401b1f0fdfba6e67f. 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/QZES72379658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0cc2ad75bcf0b001ff1d2cf03e467d391f6cb2ab3127b9a3b17b229050d4729. 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/FXQ692200412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e9841635d414b6da5d8d7d97d9959025fe01610c49bd5e794cf313d81dec44e. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZTB42285259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x934e4c7d983186b8cae46464e3b14dcdbccec9501446d0813c20fb57f2bb9054. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZMHM2267659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94e7821840db94c9b51227a1d1efa624f1dbfefba85e8ba4ef416ba4e0a6812a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBKQU2260964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbd9b76c5540941bc75e5d9c0482a1b8c8ec4b4220c77bd578f5625975bb149. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZES92225169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56cf1dbbea297a46d2043fc95677906b3a50611945a9706dea7d1f192cbffdd. 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/GBLV62115703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8d5844f8938328ed1609d3875c9ba5bfd2f3a33daea5af09a03212ed3615ed. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHN42149409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5696fac4f0daa83f304db8e2b94beebeef912a407b1b1e0049de97c85ff4e4e3. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZNWX2132325.