Jacco is a Dutch male given name. It is a form of Jacob or James, only popular since the mid-1960. The spelling Jakko is uncommon.Jacco and Jakko at the Meertens Institute database of given names in t
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 0x7d0b909717ed56677840d0722660ae20f4b2fc399bd4cc4004d22d85cd7d6c86. 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/43c0d1e8-2b5c-4459-a25f-a9a1f6982cb5.json and https://artists.proofprofile.net/proofs/artist/43c0d1e8-2b5c-4459-a25f-a9a1f6982cb5.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 0x7b4d4007b7df8b044cb75ee3274d2b41161fb27b013572343c507ee08dce8840. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/SEVQF2200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a0db82d32ae4909e2f60c065040c88af7dfdc95eb605cb90e0747e683540cc. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), 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/SEVQF2200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931b7c0f037c5cc581888347908d0e0f07559691b106d42441e9ec15d8535305. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/SEVQF2200105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4d4007b7df8b044cb75ee3274d2b41161fb27b013572343c507ee08dce8840. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/SEVQF2200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557b607cd33e9a3b7f85b9f9e1d159f8e30bae43596850cc73f9bf7c1abb1543. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SEVQF2200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58904628d4bffe38aa89f28633f6632daf8362b3ac370eed93e8a08a947f3454. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/SEVQF2200110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1eca7257eeae43ffbf4f8b04ae35802b72c94a59b3a0c6b37a3777467c9f68. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/SEVQF2200111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5261ace8f36d983237b2da4ffcb23a14aaf3b8767ee11a3c65eaa339cdca2b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SEVQF2400201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd991e784d27278c056f7c3182d10840158d5017bbf781fc67b0a71b27dc9a2. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SEVQF2400202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b61518299129f4f17c87f69f3ec04177129cefbfdb56dd62ed1a4a1364cd054. 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/SEUM71600831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18138a0ed26671b70bfe917cbb8a448192dff99f8c0540f9a378aa932b242832. 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/SEXUD1700601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8217d282525d24f55536db0ff8141cf58f911c5958e91834fa32a3478fdca1. 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/SEVQF1600901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9634f9229c369a98b2ac33a68fc3b2ea8b81e4123d3a28d5ab92f26eedb7bb52. 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/SEYVD1000112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf293c5b3529456a4c796ef448b1539b82d2dea635a3bd37fcf0f008f1bb48b24. 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/SEUM71401292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283afcf3e7d31aff2837e6251bff2805fc67a13ae347518498e8942b9ee8def9. 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/SEVQF0900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d4578fe2cb6aacf2c89ee7f148943a300f35cd8e3b517163b3af090c1d0de61. 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/SEUM71600481.