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 0xa7122890843bceb7e184754e9a1748f156c389fb6c2f9347f769c1ac60db97bc. 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/552d5902-fe03-48a6-9a54-8a94ad9233f0.json and https://artists.proofprofile.net/proofs/artist/552d5902-fe03-48a6-9a54-8a94ad9233f0.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 0x9c29a30a2bdea7808ad71545de4674bb1fb850a26d162397bda636289b464f0c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US3DF2282842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bea17f97ba54030527d0b583c8ce8869930e9ea442ef61f1a657e6e709ffe5. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/UKZGC2405956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b1b2790e479e4773e7399174f2b42c532ca2e096d256cc2a4089d98960c82c0. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USANG2426304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabdde9d88dd21e92d8f6beabae986fc8a21f7d522323705bd48a779daf7dff4a. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/DGA092437508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f7356920ee0f07663814985860179d2796e0603b0d3724a2d26d2ef9bd8454. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZAKB2422047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da9ae2e016b2555c7cbab119895c60f49ceeaa11aa553211eacc2ac84efa62d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0H2436079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c514d34ac6608e02cbb4e2bb92207bcf77b6dff6e19972065fab1712805db4. 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/UKZGC2408474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924463197699e04c60bc6488349ad8e9807d4e78c1662fb044af4f9143fb050a. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/US3DF2490960.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dec74c8cba7c91d74dcb004fd1b49a856b88e5c84dd4157796c5d8bea2da58b. 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/BCVH92300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbfba48f7209371c67bc071bf3a5654199313d8273d737c1e8c49ed5a221c504. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US3DF2463453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bea17f97ba54030527d0b583c8ce8869930e9ea442ef61f1a657e6e709ffe5. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/UKZGC2405956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47a2e71d52a5bb4e534ff9d038dd6df391d2dc0d02ffad50e640d1c8f1cf6c4. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/UKZGC2404434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0f1d8dfe5307f9204b0d26c21f662d062608fc6cf12954c229723c4727f25a. 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/DEZC62468949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c424e1af38971105471b03af580b07d6c8d3201d77e2755bc2d880ad384726d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/DGA0P2432761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb969edf0060580e57debc1fafb1b976021a0c5c0419f053c5e503683ec28fe72. 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/US3DF2519034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644d21dfe03397959812fe29b0198c2dacc22bda38d5907122a5dc8de89d0a78. 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/UKZGC2411281.