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 0x14af91df9d66a396431984c91306bfa1fbee7b34648a77bca047d598d44e950b. 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/582811e2-8403-49ec-baab-f31eb29b71d6.json and https://artists.proofprofile.net/proofs/artist/582811e2-8403-49ec-baab-f31eb29b71d6.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 0xbf04bf23a94f33e0f43808078a8a3a253f35008a1a85bf4bd12d55318b20dd8c. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DENM12000069.
2 Trombones around the world (Übungsstücke)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd300883e9bd465195fed9f4eaf471a08a596bd30aeb952c5564b8e7476ccf03f. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T06:55:55Z), 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/DENM12100021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3e909003cc5a470305593ec4e6a17da21eab4ae727b63aa62fea1b288e9bdf. 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/DENM12100025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6eea45b19fcd03c93aa9aed1c37e0383ada9e46b80a8f835d90e5e7f5a351f2. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/DENM12100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca9f1f3cec8249e65d4e8e2548e825f0535731bfa62cbe3c0c6a7fbf21e3efd. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/DENM12100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257f1328c2953446586d3a1f47dd7a2b3029f68782f8274932693f06b353cb76. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T18:59:48Z), 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/DENM12100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52eb9a6f5def6938f7f1824564842d0e9505fadb50e09da1b80ef92da85e90e. 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/DENM12100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52f2c52fdbb6dd7119f658fa093f0a9769826e07d56111ec91d07d0f2e5513d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/DENM12100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9397168f6ff8db2914e43529e0f70270762d251b48ed5b3664d990cf00bbde9a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/DENM12100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ecc81b6e185ff0a53b0d8810a8c59521e654f3d284b93cd2b3686b910047be4. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:23:19Z), 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/DENM12100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cdebf973f44e984340fd29cd415c0c392994f4c674a2a29975c229984dfa05d. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/DENM12100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64835b88a64809c4a6879b4d90b1bc2f7ce9dff88b589736b81d4b38e53d0da5. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/DENM12100238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8b26231fdb9ad28c8fbf3edc510efdc1ac981742d3523c8f7bc0e412d3abba. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DENM12400064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe53bbf5116c6261958164929484ecc4c63305b1cd92fc5ba36e3e2dc6a21524. 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/DENM12400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9cf9137e429746eae6d775471a2d6b7cb5180f8e64e5c78ba08c592e7badbf. 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/DENM12400063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a972b439b1c8b05a394696f399bc521f14859f5e35bf099968ad96c41cdad1. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DENM12400068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415179c36186e0deb0f4be38fa38ef10ba2c0b4e602320c4d81ce2afad334643. 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/DENM12400067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8b26231fdb9ad28c8fbf3edc510efdc1ac981742d3523c8f7bc0e412d3abba. 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/DENM12400064.