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 0xaf62ce1efbfe44bf0f5cd3c92c9dfff247e258ec608d16efa7a7ae3fa13ece43. 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/cef98039-41ac-4fa2-ae9f-93cd87175ec7.json and https://artists.proofprofile.net/proofs/artist/cef98039-41ac-4fa2-ae9f-93cd87175ec7.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 0xa519690662a080589564eeaffcc9da260a762bb2817d1ba771eb0f416efee63e. 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/QZMEM2054557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc251eaea2ce35c4fcec312b2a11e265738500af5a840dc98d2297a174ee2f96b. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZMEM2054558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892384ff0887b749926ca61fc3ec5e845fbab576a818fbd9b956ac5c60f62367. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMEM2054561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb130214658cb1ca4d04d40fbe010ffea2c31dcced87ec3587d5388f6d1a3ed2. Chain 2 (Bitcoin): anchored in block 958122 (2026-07-15T10:59:20Z), 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/QZMEM2054562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db11bb2bc0d5b6c88b58d859c01879b0440008226ee706a82b470a48d67ad17. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZNWV2206963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60583380ae3b066b64f0be5d74d3cfbd8590928cdc54dbaf4167a0401657e6c. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:04:27Z), 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/QZNWV2206965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40cb331df70f80df0cda144c515022a3d718b6d8ef2d59c47a7cdca290a4119. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:10:47Z), 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/QZNWV2206966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6f4d4dbfad186999e40fa48be62a16955cf535b4567b542702aa7b3658b650. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZNWV2206967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe3531bb18724d942a5ffdaa4f109b001cfbfb5e7e95892c4cf9dad1baf8aafc. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZNWV2206969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bcf013a40729e049d0762ba4b3c579c9e4452ccd94327c9f2774df0b59bec0a. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QZNWV2206971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f793142528bb47cf15e4aab625c278cd8e0fe51d6cdbb25db13a51b83495fde. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/QZNWV2206972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa705d84b7de3ca36ee835d5e05147fff5037bcb6af702c096aa343f2fc6d7856. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTB62269288.