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 0x04ef8e1d9fcbc0edb70cb13fd87f6622a9fbd2c1da2d7c22ed45af12918adadb. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/edb15fb3-aae5-4c5f-9555-83c9443cf71c.json and https://artists.proofprofile.net/proofs/artist/edb15fb3-aae5-4c5f-9555-83c9443cf71c.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 0xda01d4656bb774b1c9ebebe2215401ddf22674a5ca56b7611379016316b7295f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZLL92344240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd3a5bb14806a746809654f28219b8fbd48846aeba53341f433269cbcebe8e7. 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/QZMEV2359462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b2d60fe4ca49a6ceafc3854b7d73206ff2f52ebd45f12dd21f27d99c578fdd5. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZNB82337865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce80d5b273cdda78b729f2e909899f6596d88df0518c286567d5ffc8b52ae70. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/QZNB82347997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2e4403dffbd38d8e2a37372562c722f1b55bdb7a65cd88117950212b804ff9. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZNMV2356385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb82e317e4234d12eadff8056354fb4f84a5e59d4bc900b8e4a06fa28ced579. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZNMW2394090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd626d60b0f97ecc5c797227987e341b0b292f7d0f08b3c1daaba7310125843b. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/QZNMX2364361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc65ba5ec37d9fe5c3408c06b8635efa8eff5599b5b67fec33d41ad0f0dda313f. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZJG52480570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb082b36398d1a6edb706ee3d3b65ee08a28a9a5e45daac3cec5e372588b341a4. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZLL92421411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10f39a82e898bdf2c2e8ff987f2c92264ffa0590ed4d8f0c8304a80e0ad77afa. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZNB82410549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3ca88c41bab89fce73cd2bb78723d8e872d4a6eb9a49f5f2ca9e6c6050a7b8. 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/QZMWW2497697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d17587f6f5af08ee8bd63aeac5cccf9c6452842b47dd5f91553fe7c96efd517. 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/QZNB82485667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903208aa229f01ef98c173716af0d6f81b0f552f3ac91de6422d880e0d9af755. 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/QZNMT2477041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbeae2dda6f0b77c90feffb16d3c95db037ad7123b1a1d3a21a5e0ff164a0eb. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZNB82559744.