The Black League was a Finnish heavy metal band. They were formed in 1998 by Taneli Jarva, three years after his departure from the gothic metal band Sentenced. The Black League's first two full-lengt
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 0xa949ac54ee3f9d5f87f721f4d92bfeec8c142c7b5a11a6d1f50ca3e8173a0ae7. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eb80a830-902c-4af6-915b-5a1b775cc19c.json and https://artists.proofprofile.net/proofs/artist/eb80a830-902c-4af6-915b-5a1b775cc19c.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 0x2b1d1fd5f9afed77b07d5159240202617e6683bc4d7b19a6dd0b0133491e2a57. 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/DESK91893601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156515b9c8c0d0de7ccfba43a7e5e58dee44b3fcafff8cba8d6eac50b4b0ac28. 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/DESK91893611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2471b20a179e03a08b44de19b29aae26492d8f6479c5ed62980c860ad4962c4e. 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/DESK91893612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0319431ecab0fbd492daeaadb8a4648b56187a1b1ad211819c5cc6ca77cdac. 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/DESK91893614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6e596d38746df46c9d32b74a9dd5adcb2fb671b43804465e9c7be56f4db2d4. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DESK91893617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd57a900ef3ef1b101b58ff7e8e6fbe30ad2b42f15379195ae26b139b9733c8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DESK91893608.
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 0xc6d530c75ff119cc1d74898a364c5e66517ef125d5ff11b501faa2dadc256a11. 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/FIUM71001368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e593a707bcce26c74c83b69da04b973233085db6ce12907ce97decfc06f70a0. 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/FIUM71001371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a2cabffef163ebdf4e8b188666f394ee1be3d4bdfc388bf9f0557abe0390de. 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/FIUM71001375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562c544c8d18afdf1fa045ff257f39fed4d5f0e1f04347fe57f20ca7895078df. 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/FIUM71001377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb88184dc66a2ba9711d271405105f6e72ffa8004ffd2d356b2b592ba7d146f6. 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/FIUM71001378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de9f2ded8c85068ff674b011b61f7afcc5575e2997c70d4c1bc46cf05e9d2dc. 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/FIUM71001380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ced80accac8c039a420f2d9d7397b42a120101ebe204c2ef23f85a2c649e2d7. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FIUM71001369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0efdfb4e13479dcea84dbc51c7433c85aa6e73ebf12721cc606c498261cc78c1. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FIUM71001370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6525f89a4a29b0b78924bd518136570646e99bc34c8a02a2855b6ce686de8f1. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FIUM71001372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a840406ba1dbff51feff4ffee49469a789f33d9346ac9ef5e900b757e7023c. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIUM71001373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2404756a69ea86fcf08a8b72a5b1ce2a208032f79023606b99680fa55b0da0. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FIUM71001374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25169cf3e5daae5684e6c0d6e079f2ca6f63fed6638a7551eff61725fb35088a. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FIUM71001376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87302fa5aa824f94de5e2470eaddc8d618907b0ac2c9dfe06d9b6759c421a56. 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/FIUM71001406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cf220bc12b61818b46cb4dfd6a75629fb78011416509a356cacda7cd56e667b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FIUM71001397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c204d336fab5e77c14e8112f282bf2c13ded6c81e448898a6c212b31429e99. 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/US7VG1689741.