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 0x1b3a371331c46b6daf4fb27f1da37e16584d87293e4d84d3d7522072a756c6a8. Chain 2 (Bitcoin): anchored in block 954017 (2026-06-16T23:38:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37127425-8212-4338-8d53-4bdf0c15b2b5.json and https://artists.proofprofile.net/proofs/artist/37127425-8212-4338-8d53-4bdf0c15b2b5.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 0x0823c58ddc98fb70839b6e3351fcc9e5409edd85e38cc4c44e46c1adad4638bb. 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/DEVU52258917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d6c2d8a2f847e1a09bb550d7424d9c1c8a8a1251f43b33e5340d58de61948b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEVU52258918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b7a45c0c653dc8e4968a104fd195019c231fc0528682400086f88b85c8ac78. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DEVU52258919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb259e51e257851031e5e3df09c82860d587d8c6b51d25b50aac4bff320c11147. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEVU52258920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6183d9114a8db95a4af38755e81b94c6ca56452fb4f9ad75e823c325fccc7faa. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DEVU52258921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ff925668afa93d8f29c4d427b7ffae6ac407c299a93cd757af474bb2615af1. 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/DEVU52258922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6ed053f9b1f5b42ee984567af0fb96fb426ab0ce73d3628b8777f455780723a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEVU52258923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db799524771b6b147e4c6e1f48f4f9e4c34a805ade2d534c13d47743228aeda. 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/DEVU52258924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780b759d12765633c358a687a1f2f9487f2cfaa195e3491b26e53f22fa5a3f4e. 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/DEVU52258925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b37a6a804a2f33c32fb677e97bb093247debb329697f902927c9071fd8629b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEVU52258926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5a853eab296467d083cfde0d74fca264ac73ba74ab8a0187e3ec64e246f97a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEVU52258927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a29464a8a2c68dc6afc1c3b5d096f66b1ca1b36a9a96b2f92049da5c694cf30. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEVU52258928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6783c4511d7aa132e4253e610df0f2128f13a6a9c44761051b0c9ba902a76111. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEVU52258929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03f0f04ed51482f927b775f2d9572f1bf2b0b1adf4725f987a5ce78e1522dd0. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DEVU52258930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd66eb864acb4d15b1a4f04e97309dc45148b3cb69c2c7468ee4c4b08d8eba5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEVU52258931.