Underground Resistance (commonly abbreviated to UR) is an American musical collective from Detroit, Michigan. Producing primarily Detroit techno since 1990 with a grungy four-track musical aesthetic,
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 0x53426f51907321461f161d89b7023ec0c2a708745cb83824c8f9b3bef2a45809. 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/278fc7b8-376e-46b9-b5a3-a5d9cda5f364.json and https://artists.proofprofile.net/proofs/artist/278fc7b8-376e-46b9-b5a3-a5d9cda5f364.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 0x017779095eea8f422b33e51da242ba1d425ede810ed53dfcd276a55c9bc85814. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USGUM0710104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89823604f98d22b4bc183b0412433ab96e1713fd94125e32f573d91e3e9e74bf. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-17T00:58:19Z), 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/USGUM0710105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617a5658587a331a861caa0b1de91ecd5a33d54a8f76776e76b62aae7b7107cd. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:27:13Z), 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/USGUM0710106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9df41e0fd6b935644a3a70d6ca8de5738d62ac7eec8b6946095f64738752bb. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:17:58Z), 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/USGUM0710107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731eaf3ef786e69c371bc2b4483c1a262f2da37ab0ba313c2f9f5855223eaac0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USGUM0710108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x115becb9dc223d3e5269850aad8d08d6909a582748a941c3e8563d56de2f6adc. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:47:50Z), 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/USGUM0710109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b7b9e4ac6b953f95d8b33d3302f5564b26a3699190e6f63cc68b3b09e9f450. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/USGUM0710111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d655a2601851e0c88dc28cf04c0ff86b39b6c3c594985a6b96befda604c433. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:02:51Z), 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/USGUM0710114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db948575e016d2a8bb296cc055f5d4c9cff9d79779009754daa13d46203b287. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:59:56Z), 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/USGUM0710115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a7b9915ce40d077e015ec3c93d90ee59dbed9d622c28f28e801c130ea4b12ae. 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/USGUM0710584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5fa7e5f55b851d160e677393ecb311be84c5688f4e5e7b3c852371e55491b3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USGUM0710587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afde171bd788d8d32d5d0d8b2223a7711b2d5ab971c9fdf52d510f4dfce05c5. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USGUM0710588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1cdd6e74b1c04c09cc47759505340b9d109c2010c74ee0b776f7833c05e9d5. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:51:42Z), 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/USGUM0910139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d42fdc3f352d2281d47e66f092d3fb02daee5322fecae2463a05bbfa207289. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:16:33Z), 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/USGUM0910154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0931479c9fa5da3a854766f37a2cda203a298478c9983f069c6a616b8e484a. 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/USGUM0910245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc7f9539290aa006f9fddf155669e754c813312ee07b4b7db60af205ce27b12. 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/USGUM1300211.