Grauzone (German for "grey area", ) was a band from Bern, Switzerland, that was active and disbanded in the early 1980s. The band is most famous for their 1981 hit "Eisbär" ("Polar Bear"). The single
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 0x0ac389c1466b206a6388fbcf67339866d51bc9f0d7a3baa023a4ebd1f793944c. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55ac375e-4437-4181-9b1b-65f2458aec31.json and https://artists.proofprofile.net/proofs/artist/55ac375e-4437-4181-9b1b-65f2458aec31.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 0xcda830df650b55c9e77dae8ff1e29cf19592d771002ed742a22a6e4b55380d4c. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T22:03:27Z), 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/DECY51901047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe9afd5fdb8a376380d9037f064b31434322dfb7ac587860b04656a3389e471. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DECY51901050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f59aeb61851ccd1abc8d9d134fd2e7990d1502d12f6d6d5d016c59a2d78301c. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/DECY51901051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c87d6a1865d72527084b3eefdb9e8b4f73922acb609d050dbe3d8f9a56e116a. 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/DECY51901053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c95f0053b60d4dc9a3d5a4975b6ac93263cbcedfbfaee08b08b7e8ee3d3e4f3. 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/DETB31800776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788dc19fe4a247e934b84966789155a5ed4f7d4dd50caed5f05092b901a2745d. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/DECY51902400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a898775f845658134e344b8166892f5f427d35ab1955d8dd2d39885ae86a6c0. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T10:23:20Z), 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/DECY51903324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b0dbc5c3328b3e666d5efa61fe1ae6bee4c73786ecc32d016783bf65459bef. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/DECY51903325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e3833c2f6d2cd5a0dfbbab80c93729619c6b0bdcf4196dbb4542e702030244. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/DECY51903326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c95f0053b60d4dc9a3d5a4975b6ac93263cbcedfbfaee08b08b7e8ee3d3e4f3. 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/DETB31800776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c2831f5c8099551c97fee995ce7c97cd0225ef7fe8ab42db47eb8d459011827. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T22:49:46Z), 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/DECY51901045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb502c0986ed11ce38aa8d58af5b9c3f7f229a17fca2a08abbb05dd5e13b07bf. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/DECY51901046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d53537adf09383862c2aec5c199032e0117b030600738699e7d9c294e47fc3. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/DECY51901048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf83d78dd51b0f3730f043f7fa5d3d467eafa43e75bec588bf841febc87fc9d7f. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/DECY51901049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe9afd5fdb8a376380d9037f064b31434322dfb7ac587860b04656a3389e471. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DECY51901050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aee210b42dfa3db6ec3835e768a0e9ea7ee3ab8532cd6e627ee85405e80f3ec. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/DECY51901052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd0ac8ccb382e661e489d32f80a25ea56650329b1ad3d7bbc7aaddce9211cf7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DECY51902379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5a72153c4793cdb353133ac2bfb9e42d24fc0056834470de300d47af75021b. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:08:55Z), 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/DECY51902380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0017225f6e52285404389563e73d9c08260d2bc5f6fdea1bd1eaf5ba3c24b7. 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/DECY51902401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0817cb7de3facee18267f382e44e95491b700a54c175a8f9f367d28a1f67aa6. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DECY51902402.