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 0x56dceda105aa76b74187e8798899d97b94823e20661f89cfc4d9b0abded37d30. 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/2280e590-c633-4517-a076-3bfa95d5f056.json and https://artists.proofprofile.net/proofs/artist/2280e590-c633-4517-a076-3bfa95d5f056.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 0xa0699169fa527d9e4cb2b126a0e1b5058deb2fa44bafae9ecf6882ac398cc9ae. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCACZ1791190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x976f4b2202de7bc016fe0ca44b9c747371d8994e159ce2c2370908d24e98fc10. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZ7TJ1700013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc929285e14359c917c87475aca7f4cd3beaf4ce526b557cfe0a02fd52c823408. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZ7TJ1700040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572914eed874ce78ca1c355fc6572c21b7c98f4fe327f21f2943eb741ccbbd88. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USSM12001121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f09f45dfbad1051dac3d087f6e6e232cde2532ea0fbb32ef22e4d131158c9e. 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/USSM12100763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70985365e52e3420cfede2e255e29a4343d704d289b91d151cb8e95843f7a5e4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/USSM12001119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25fc640535582a84ab92771eefa9e9cef499a283b3e3123554a0f6a1da318d6f. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/USSM12201607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ebad1449b0ee5c544f9a58980fad044dcc46966acbe3a52d5a4f3a2b22346c. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USSM12001117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b94a01649e54244855d7445ce85ae8e0440c386ee524e2a0f7f37d86c7601f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USSM12201609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70985365e52e3420cfede2e255e29a4343d704d289b91d151cb8e95843f7a5e4. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T08:13:46Z), 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/USSM12001119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f09f45dfbad1051dac3d087f6e6e232cde2532ea0fbb32ef22e4d131158c9e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USSM12100763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1958a3909b58899ddad8ca0f7fc6140312f5a0e05b584c14a69eefeaa8c7f9a2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/USSM12306854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58f2b737a508caf787918c157c1cba784587b5b2d9c807a1c34273d18ecde0f. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/USSM12306856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5fe019158555aff4f86fecf8e78c721259f0913b9915aa71f9374b1699d0d0. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/USSM12306857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47298a5896345e355f9a28f42c6a3a72fa370a762723c45f3b9f34530340f6c7. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAJL2527762.