Undergrunn is a Norwegian boy band that was formed in Oslo in 2018. The band consists of six members: Patrick Bakkeng (Fretex), Gabriel Doria (Plaza), Sverre Skogheim Gudmestad (Pus), Jo Almaas Marste
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 0x56ac65b52a01869b990f5046da582f6b38b1ab14e182de6f4792d2b892a7ab48. 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/92def7ec-00b3-4ef1-946d-089b48bb709d.json and https://artists.proofprofile.net/proofs/artist/92def7ec-00b3-4ef1-946d-089b48bb709d.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 0xe75d63028c0ca5dc9be339a2c7612069a0ab78b04e087722eee200e94e1bee17. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NO2DY2300227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd81089e2667ed5c5feec581c8944ed0e3618cd2cc2f35c6904db8f4de24cd42c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2300229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc99d2846e170a17167492e70d882e8797a09bba5cbe465b5850274b07260de0. 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/NO2DY2300230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda375fd360bd5f3a13ec088647ceaa9e75f05e2d8c83b6a0ce943ed6985ea296. 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/NO2DY2300117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880436bc2bf189733d7270730d61bd35e1cb1a3f488812c64a0e07fa5f55a537. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2200122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e628fd221ce0a885244390227e90bd17dbdb69c1f140b6fa5c865e9622342c8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2200123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395a85d79016db0a66a9a7c0595331c46de2057d7214ff2f063c5d9d5791b9e3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2200124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562381001d85f7cc60b7abf9d34e1a97483a67ec77701c45230b893cded82614. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NO2DY2200125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa524059877506423469c733b7a876e468d666f8f3cc4e5d388ddb68a512cba. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2200126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3eabc35ec0bbcf8ec1f84d5b7702ec7d327021da5535f8237cddc4b219f4ad0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2200127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610af86c186b44db23015dd349b1fdd13e18998355fea5fb202b0a5c960b8ccc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2200128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a2403f81bc6b80796395b293245012bed0c84e06598cb1e55edcf1595fd4fe. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NO2DY2200129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa258499a3236d8a5e10a29b66aefa0c1f20bd4e164822546481f98333819feef. 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/NO2DY2200130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a60e92fcfc24a051b5ea7e8e48903cb7fa3da18368d64456fc26ac91f8733f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NO2DY2200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6a2d6d42d201a35cdc71a967f1dadead65d9658833073f05a380dcb477cf4d7. 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/NO2DY2200131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51398cab0cea5736d1dacd5e2e3ae4810c9ed79f1956f281f7e7d0640a9e55a9. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZK6Q2174775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a2d19818276270d0791aa51b7b7b8288c5c0c90146e77ff9926af9c1fee473. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NL1AP1957959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73497887a1b7da3de133c3a3cd3161481b86de899bb877ea004e62871eea6b7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NL1AP1957960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d35db919b027f24d738d88e26a6191dcc06bce2aaf6e1c9d9a4f79e00650ba. 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/NL1AP1957961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x484db84506db8f17ff58fa74943e1593b646004bed2e6a42e6416534a86c6a18. 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/NL1AP1957962.