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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 0xcf31017e9c18525f0424d814e340c05f0ae553046642dbab64a5dc3318506d7e. 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/d1e247dc-39f1-41dd-9a42-99128b288185.json and https://artists.proofprofile.net/proofs/artist/d1e247dc-39f1-41dd-9a42-99128b288185.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 0x5d64a1aae9cc18cedd2c9d6ed1da4e8f2ae204a657decfa5544c4db8814f58ae. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/USWB12205151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0d9d4e9bfd10da6b0c0967d5b785f68fb5ca0b8afdee5481c0a6c2157774c8. 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/USWB12205154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca3e1adffe6aa3e0e86972cfe529e1897c464335621eeddaef136ee63c269c01. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USWB12206435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a66dc8928f7704bcfe03bb16683f995e98889a7c12fe99e4cace8760e39ed04. 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/USWB12206515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adfbf111536514ad4aa5616ef0bedcceb50ca88c10b6db78c4bb805cad1c468. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USWB12303262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707bd9b7e032171f6b98bbdee5a0d81321e110c92544de9eb05516050a933b16. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/USWB12303265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4791995e321255dac9cbb0ac805c11ceb32d6c8b1900a59b92fc9408ffa0a57. 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/USWB12303264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872a812be28b9136d3c46be898e6f880530ac3c4b8788d3d05531399636ef92f. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/CH7812534858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067043e9a17b5023e1ebaef617168621513408e91cd24e392cce55e4d1a7389e. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/CH7812548136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2ad6c661d4c5764434c0e210e44541af6583f7479de397743c669e78883ab7. 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/USAT22304147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796406f14a95e5cda3278b5f642101fe9e25f15039b4122af363c3c95c2b70ba. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZSYP2278586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2ad6c661d4c5764434c0e210e44541af6583f7479de397743c669e78883ab7. 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/USAT22304147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1570d0f7af8e395bc674d2936e8e42f0e3d62f9fe3a0c7d4c088aacde952cbb6. 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/USMLG2402205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ecfb7a1ab4582ceb5eb554538f7d5eeca6277849e25c0d3fa66ea3955bde3c. 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/USAT22400688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391ef7e412503eafe2f3a11f157edbe7cffd9bdea116a48c259a05c50c502a9a. 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/USSM12306721.