EFA may refer to: Arts European Film Academy, a trade organisation European Film Awards, organized by the European Film Academy European Festivals Association, an arts festival organisation Co
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 0x807ee042182a13ae0118d4cfce2add49768e691c0194556f4519218f0fd6d417. 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/e21ebc0a-e597-4337-8f9a-b300dd37d435.json and https://artists.proofprofile.net/proofs/artist/e21ebc0a-e597-4337-8f9a-b300dd37d435.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 0x07b0382fffaef8735dbac48d10cbde05e141285813245d2413d4d4008024ff25. 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/SE6XW2380126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5bcf0cacf7285dfa841005eedef610c7f227389fdba320ad225c78db2f56ac. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX8LD2390015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bd929bf913da499eac6ec73ad098429ac988943f5296bca67cd98c93fa16c4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BE8LH2400057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af4bbf0ced1664bd7a5ff94e6c4c4cff13d61d941dbf12d14114be62da918b0. 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/QZZ972312577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc090336138d61bdcdd72ac71fbf592a42176294cf0006bb2aa45f7c99fa5624f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812368255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3420c447eb3e1417cb927737f6fd99482e27e62d8e7a72480d6f8332beeb7618. 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/ATEK02177092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc306ca3687c5207df3c1c422e0c9e4a8cc10e0ed24547204165c4bb74967f137. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BE8LH2300186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678395e20fdf98b825ecbe5b77e46314a7cfaadb7f94569a5a228f979ca11e47. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDD2418883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b5fb2edd24710e91a19010f0cdda0c252852d8d5f5c1afee0da21cb2b6c2a1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLT2H2400894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b99b15d3f77d8542fe0cbd0301820eb485931fca1ec9c2c1b686f563f37ef2b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX38U2448854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0394e951a6bd56ca1b288a708de73721c217c19e5c7c6af22cbbca5ef39e3f14. 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/FR2X42563543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d807ba0f9b26843221bc86db5542103b0706917fc1136149e1c17852312de9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GX89G2598183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7e8dd705a7f58be82987e1fae3df6809b453f94f791daffc0e4675dca7f785. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLYK92400280.