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 0x52a796f3bfac55f3e66463cfa58c8f364737ee671ba43279d779ef8488017bb9. Chain 2 (Bitcoin): anchored in block 953641 (2026-06-14T13:54:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3bf872b2-0008-4313-9b33-507c615a816e.json and https://artists.proofprofile.net/proofs/artist/3bf872b2-0008-4313-9b33-507c615a816e.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 0xbee528db5e7593eeeed24a8979946dcc47dc2c62f0c2bd9ff5fdcbede0132290. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HRAA42100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f4866ff9e4c84ed9bf34a9373ac8d7cb09378fc20fc590ad5115fce10c2530. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HRAA42000151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0317dbe72b09b9386aebc868438dd749a312346ef7f8c35fb6ba6d1036ff13c9. 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/HRAA42000152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f74ae03de4097a38b7c2f1c9baa192063294a68a7743af2f1af291dedd65ea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HRAA42000146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5f119d15bee3a50940bdfb200cf6fd0ffec4161dcc1aec0ac5c6ed58adc651. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/HRAA42000147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2689588f9e1b46fc148f0082503579a1ac7e3d395a6565b0d76e3a1015cc114. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HRAA42000088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcb83997400f7e219e728a5e6f23b201e450353329b4dcd7d01070e8638ff87. 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/HRAA42000148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6451197e4939678e5a28c20f177bc26f851d6cdaa8032da0d8f42bb3393ae0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HRAA42000149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2689588f9e1b46fc148f0082503579a1ac7e3d395a6565b0d76e3a1015cc114. 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/HRAA42000088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d940ba8fece687d8802452122fd523a7f5ee0508d6d64a7b58fee8c586799aa. 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/HRAA42000080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd532ad2826a796746a5113f7bd95f673c49b10b15d4d41e8e42b8341e1b2fcc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HRAA41800137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4554d9441d694b62b1c8358b77a49bcb849795b30f88e4dffa185398d826b46e. 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/HRAA41800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17fcf608122630c468f266def1d6dd380b76b9e1117a9a01faed384e97025996. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HRAA41700685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42bbc198fac22857a0cdc48cb1ea9134720de214a63b5ea8856a1d8811e482d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/HRAA40800451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf448e68e136cfe4a5b84114189f9bb5c2b477cb5c78f0021fb0b387b77df5bc5. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/HRAA40500155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb334fb805ea69d8471083a73c66f84998bb5c8e2d77aed232eede1a152eadde8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HRAA41300026.
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