Page Four is a Danish boy band established in Copenhagen in November 2014 by the four members: Lauritz Emil Christiansen, Jonas Eilskov, Stefan Hjort and Pelle Højer. The band was discovered by upload
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 0x6f2b936b34c86144d21ac0fe809e200f1afe41738e46dbbef6c921403d4a2ff8. 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/a24ad05b-c415-4b11-9f81-b7da495e24bf.json and https://artists.proofprofile.net/proofs/artist/a24ad05b-c415-4b11-9f81-b7da495e24bf.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 0xcf12b2b257bd0948be3f5fd21945356083d5dd27dd340fe05c55e6d911d40559. 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/DKADG1600162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4c44efa68f8ecb38c74a42d7c76c370071a996d92d802cb03153ba780bfc28. 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/DKADG1500344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f5d71b9684558dcf93dff5d78073c98cca802600f7f4dbf6c29b97865cd591. 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/DKADG1600097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06184fa3d8d8281079780ce209e7d17fb0cc4b532e876780ea7f30d11ef328e3. 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/DKADG1500491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08735dec4241e23002b8fcc5dd6813ba9054e28a8694cc577b169d16c785ddf7. 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/DKADG1500555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f10c9196f2b336a4a0183c77ee998e9d0ac41b09f4de1f247050ee96f6df14. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DKADG1600163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3896a7dd3fde4c85ddd4e9d32c57d24d7d59821a347199f38e035b34fc48e8ed. 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/DKADG1600164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076503c40ec35a49212b75697c2c21ff1cca11d579d429a6cca99c3935141ed2. 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/DKADG2400459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad5737227647fd21816fc05761fded5177918cd339f5af3379b78e551be8a17. 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/DKADG2300545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57261631ed21c36788f8328375b393121b9e213a8e1026950429f64ada43e254. 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/DKADG2300328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ae920a2cbecc73d98cf7d249c3fdbbc6265dae2d637cb4392802f823b4d5d5. 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/DKADG1700535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d0faeda141141708e6ae58352411df7413a6a5fadf58f462706bdb76c24a08. 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/DKADG1700308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5f3a9b759dd1d140169ff09a35e409918992692bd32edd1bf5346ab04a45ce. 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/DKADG1700231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a4299270c0df34baf5a5b3db7029d12bbb7d547a65c7eb8cd5fe58799fe80b. 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/DKADG1600464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a728fb5a096c31c02bd6da1c462f438c88159ee912095a6337df215c3dbc6c5. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DKADG1600055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67bbcb4189468911f17282d334dccda0ce2a85444d4219f7660e14fc4a138b46. 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/DKADG1500368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fb96e3feb128cc42056b43dc820ec17dc9adfc89e2bb6446bbdb4613fc6ba9. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DKADG1500369.
Sommer - Arju Foreal Remix [Original Edit]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7856522f8fc2d7153be4de663b32bb5c6207aa1d67dace86036f4a414aa46b7c. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/DKADG1500370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1933b57ab807b383a354bc83e06712592328a94e497b332098806ea4be614736. 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/DKAZA2500033.