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 0xf544b52237327272eaf244ecd4a78711db6139175f843cb91ea4f12cf48f8f15. 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/a1b4b6a9-b63a-4e4d-9ee9-0a693cde59fa.json and https://artists.proofprofile.net/proofs/artist/a1b4b6a9-b63a-4e4d-9ee9-0a693cde59fa.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 0x86c35ff2205ae3549e78975d1ecfef653ed4ad4a277cb5de413fb52d4cf68e2d. 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/CA5KR0030184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x677828f4b6be37777e0bfce5a6bb862d79af4bc2a0cd7222ccc759bf251fcc5f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX8KD2415732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ef5c44fc924470c02ea08af4ecc8a6753bcfc5e971b9b2344e1ed6675c9966. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLYK92300184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5758ae41f6b18f405e37014b2002730b92f881228825a475ce36ea5dfc925c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CA5KR2395954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b26ff43c2926f34580eb78ee43585b5ceee9fa047f5ce5203e98fd03746042. 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/CA5KR2386875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7b6623a46d2f901817c7474616a635954720ed36691f684ebe0717cfde2cb2. 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/NLT2H2300681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038ba15abc0abc71c1bff7b06d04154e831b97f7ab858c789393f4c1f35a2efd. 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/QZS642389987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c65a57b5ed5561a460d9af574797e81658bd0ac7c8f1474cc66a0c2d3a0120. 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/GBKQU2336970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9826de76fff2b5eb2defdb45d82a50c986e54240ee4fe0c143dfde2456dc0191. 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/DEXW62300068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce7e02af0ce2014c5d99f929c4f2b4e7da3bfd5106d3dc3225cc680552d15c9. 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/BE8LH2200154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23fa38b6482cd8dc8b031aa547026b66b94b6dbcbdd23a56bd4f21a392843a8e. 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/NLT2H2200597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9520d65d7dc1ed2891ac061a1a7973cb059e7dad101db49f9aa222f12e30d5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BE8LH2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5d3ffd552fbd6ca8e9ad2d9a823b25971c2ed26c6211883438ee7cf45ad55b. 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/NLT2H2200209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1896cf4064970b5a5de0c0072b254765ec375b7197d1901770849179a9ba632. 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/BE8LH2400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb290820b8cacd5f2b2b414b13fdfd6e509be317690beff6899ca0aba12dabe9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DEXW62400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cca60131fb8f0e8bd48e3d2235e102abcf20a5c42debf4219f865e1c26a93ac. 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/SE5752425875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f46aa474f4af6c8a8035d01ef7678f58474f80402ed221d6f1b8ef977c6b3e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLYK92400198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9520d65d7dc1ed2891ac061a1a7973cb059e7dad101db49f9aa222f12e30d5. 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/BE8LH2200067.