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 0xe5c5ddeee615f664906861004b237a3cb78228617be1dee6f33476760dbceb43. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d2da37f-2780-4a4c-bc9c-d6e3f4f8fe72.json and https://artists.proofprofile.net/proofs/artist/7d2da37f-2780-4a4c-bc9c-d6e3f4f8fe72.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 0x5be1759bf8148c54aa1ca9e54b0a54995b69f188a5280c6f21286ded8641009f. 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/NZAM01800112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcccff1e85acdccd8cb5ff8863dbbed971359fe8ef9e606e439a5c1be8be94d28. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/NZAM01800549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1885020f3455f509fc9444ce10e804189c719fdb2c039de562e6aca13c0147bc. 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/NZAM01801414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e037890b8202a242928c722976febcfc9f9e9c6ff85089305e37dd95f90c61. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/NZAM01800730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bcd90af24d495ab6d432cd47e30e27e38d9ae49277192c0773ab3d9baef65d. 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/NZAM01800189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e3aac2df049bdfe7d7ad83a0f52201e3097a27ef33204db3941191fb8e1bc3a. 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/NZAM01800811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671da42ea01906410cab0bc00ad9a61518dc0d7a4b27263ee8767d29c59c1a18. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/NZAM01900736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63802fac1f0b1e49c33e88a8ad33734ceddc836323cf7cd1dcf2b1cd6dc714e8. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/NZAM01900737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d76c69b40cf6364918636adad6a0073f6560b51450733d1e290f63372d2f78. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/NZAM01900740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a703fe322f2d2f2b176ef23d277a5b63d6f6710df834690ab907cb80b934af1. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/NZAM01900742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849c3820065a85aad94bae06bf2dcfcf6b341088fc43882a9a3c6e8ed0956507. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/NZAM01902175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda248f46d00d2e45955d8ea85c6c1e43760eb20e2842af135c111e45010ed68b. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/NZAM01901587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a39ea310bd270675a2e98f024a2d88e07a0c6892cc5f97b7c54557366464b2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NZAM02000535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe116893adbfaf52dab135a318e917fb80f02522d8becd5977907314c9f805b6f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NZAM02000791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27cbf6773b296b52fdbe7faeaf7e194986ac0cf014ad93b8ce91fd84b076ab81. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/NZAM02000120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc881e2630cb91744346bcbcd5f1dd592fade9eb7a10d8c3383f58d535fb893ec. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/NZAM01901914.