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 0xd3d35b1faee2617542e703a1f48bf1997f9558d23d29b43ff969c2d40834769f. 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/d6908d47-2d4d-4b5d-8461-b77c326fbdf2.json and https://artists.proofprofile.net/proofs/artist/d6908d47-2d4d-4b5d-8461-b77c326fbdf2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Entropy : Zero 2 (Original Game Mod Soundtrack)
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 0x6298b0664f4fe2f9b9c84ec52ddcc6ffec724efbbe5eee7658d79df93d8c9a90. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZMEQ2293389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f620ffe07c43c69bb67d770b00dcff487e519f251e7cad82e864671184e3004. 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/QZMEQ2293391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8fcf7b29ae158b65c90a6a0e4d25877b25574b67085890ce04fc152fe1361fa. 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/QZMEQ2293392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac40dcf5479d3618e89eda423d57f544cdd77478447ce3447b6edbfeb84d4ce. 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/QZMEQ2293394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8106f4ba6eefaa168f8509b27a026c59d17f6a7fd3f9ea8f22369b2b5c50cc2c. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZMEQ2293395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52371996ff0a374fbc750d829ccb1fba8a4d6147ef7998b372531967a1dc32d0. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZMEQ2293396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fce50327d0a4e27aa9bc07228551e88429eb5e2fe68784c786af6332e47d17c. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/QZMEQ2293397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea29c00c45c2077da9bbe31dbfb097b9b9c65ac06dd9bd9057cb29258e9782c. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZMEQ2293398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c74cc2f8341cfb26f8faca15f731db17b2cd5e8ed8d0a5f1699acdf0f189582. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZMEQ2293400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0a2d250aec28498d883b2cffe9ef74d453a0e625f0c020e1060999a311e62b. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/QZMEQ2293401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21eb52c3a6e3f0964afd79162e1d86a4b10890fddfc52e1814c8b07d209749f4. 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/QZMEQ2293402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9668a74c406ff069c9a524a4b736aead32b4059141131779e1bec69b38fe2e77. 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/QZMEQ2293403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e21c22b9d12b0a4e422128bd8815ccd69bb7357a9569e28efb2a446dcdc4b3. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZMEQ2293404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d37d52f376f832b0e46adf83862aa28976f43612e56b5c88d90abbb0bca2cb8. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZMEQ2293405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ec3dbc3418fa2ae8bbf9c74b73c658218b775c976cce014de501f190de017f. 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/QZMEQ2293406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50042085842168d6b0f2c14785ecb2e4b94386ec91f2dc8a7b54520360e2446. 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/QZMEQ2293407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132d2201b572e818aedb405b3b83461471ac1dae32b28f2a54a5b50af5cdba7c. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/QZMEQ2293408.