STEF (formerly STEF-TFE) is a European specialist in cold logistics for temperature-sensitive and agro-food products. STEF is active in 7 European countries: Belgium, Spain, France, Italy, the Nethe
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2b58a7a7ebdc6c005588d89af170be12a6c2b0e8d64bb58414c26097f888b7. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39aecd31-76b4-4879-ab4c-5c6d9afa7aa9.json and https://artists.proofprofile.net/proofs/artist/39aecd31-76b4-4879-ab4c-5c6d9afa7aa9.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11fdda3006663f4e61c8021b3ddabbcd3e65aaaa527083321efa70f81b0fe80. 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/CAB381320001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee651e2b50e147fe5d6af9488b71f03fbb6283e78c41d18b78e8dba0fa48b25. 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/CAB381320002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b657112b26e95aacbbcafc7aa28b454daba54775777455f63a2fc58eb2925fd. 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/CAB381320003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa70994f3e8f6ac5d04b372a138885480b7fb163e98275df1b48747047e29f45. 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/CAB381320004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0921d438681033a4668f994ef7726b002732aef948410b5cbd86cd0f4966a8b. 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/CAB381320005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5156f7281d07ce3013f46c91116a5645603c7531cd37b17d2b2a0949ee36369a. 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/CAB381320006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5ac88b3850dcef1cc60ed4f547c9b592378facd5736ce4f88c4a146de4c790. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CAB381320007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55fdb4287ce71692cb214a68d24c2ff4f6999a5179692b79edb93d92fa69ac5. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CAB381320008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f2df4cc083708d764446aa83fd7d9ccc27772a835813d029b1b74658ab8b76d. 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/CAB381320009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9983e228916d3334cb4efb6f0552c97281636087d2f30d44d61f9f3e40598230. 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/CAB381320011.
So Danço Samba - Erick Paredes Agape Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35aebd6721be3c5c25e5d78d7e3707ea38b82592492298e249589df833c56388. 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/CAB381320017.
Essa Moça Tá Diferente - Monster Taxi Remix
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31ff4dba5d5360add5df40627285967a2b2a848666cc26b413d7cfa2843abb3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CAB381320020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313a172b4073ea534e0d616ab2df02ffc821bd785ab6fc76f7e3f448ba9b1a6b. 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/CAB381320022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8390e83300dd902cb5a347d8e91d7bfcd30ef895f8e83be432ea16c1042da9. 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/CAB381320023.
O Tempo Vai - Richard Dorfmeister vs. Madrid De Los Austrias Boogie Dub
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b1e13819ff235ee93067bcdafe9c4b8c7d80e65d00e7ad489d98d848bf26a8. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/CAB381320024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5fe961bf8afb1e36d024dc8d9be6cc97e762bf1cd0d256697e30da62b8e9e56. 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/NLS240600420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8c270713b12bda7da0a576ef33247808dcb33bf8566dfcdd7330f4696857bcb. 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/US83Z1327850.