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 0x03708537d645dbfc0b50563b0e78c79d3a0c65f0730bc57f34e51d6adb7ccfec. 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/0f2be7a4-f0ad-4fe1-97a2-0b28beb79fd7.json and https://artists.proofprofile.net/proofs/artist/0f2be7a4-f0ad-4fe1-97a2-0b28beb79fd7.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 0x9c10bd37dab293f5fdd93e3e1488e3dfbdfca6933a59cf390bcd69761ec489ec. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEH741644008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x734c3c6f85d4952bb5db61daaf1cec6be150ff00c4af5b311b9cbefcd8fd26c1. 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/DEH741644009.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x725fb5e4895b1f2639b31204561c56a5e3f5e5f8afe8bb0ebb42b6e61068b137. 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/DEH741644010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7060d4b7952ca56f62a2532c1f30dafaff01c526709ac1971ad5dddcd33768d1. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DEH741649016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a551b17785700b0466f5f294c7c58c9b069b33f34ec033d21e5ad3390002fb3. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/DEH741700799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76fec401756c9da6afedbb83cba03b412ec3c0a6b03517f1b6020a3428514a9d. 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/DEH741705922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7060c285fbcb7a692a1bba70538ef871d04e877c01769a3e4a94b3ae57aa35b1. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/DEH741700798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa175c3677672fa7ca1b04c7e61e7eae50a0b7a75ea54ba4cd4ffff366fc2a8cb. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ITXHA2110009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eff9e105003609dfab968fa5ce5c94432022ff2c540fb616d838a7652698159. 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/ITXHA2510017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b1fd483fb105bf9f2c31c560ad5f8115c26022a052df0059d49c6bfaa54b9a. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/ITXHA2570008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874bfe5d786c5b43fb6e0c74874d7f0f8f002f371bca0e0531d6bfb8fc0c8f33. 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/ITXHA2570009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bb042353b83a9599f06d4adcbeb86512c5f74aa77448c07f78fcdb2da420b7. 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/US83Z2325017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001f1ac9e6bf66e9daa703b4f82d677c38d02674f5be82b5e397c85cdbc8315a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ITXHA2130017.