BOL4 (), also known as Bolbbalgan4 or , is a South Korean musical act formed by Shofar Music in 2016. They appeared on Superstar K6 in 2014 before signing a contract with their current agency. BOL4 wa
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 0x0a78c27b70dc42412fb8bb62f0c4308496ec5e816d19e414ef151c4349487060. 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/77df6d7b-378e-442b-b558-9372a43ee281.json and https://artists.proofprofile.net/proofs/artist/77df6d7b-378e-442b-b558-9372a43ee281.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
START-UP (Original Television Soundtrack)
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 0x1b561dda5860239d6944b518f65b25e058230b2ad5dd8f6fbffc291525e405d2. 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/QZF452010465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cd9989ca99914717dc601e6ff125b543bc87c0743aacb33c7728b61b64490d6. 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/KRA381700260.
HWARANG (Music from the Original TV Series)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb879f0857071128be04819071908e5141a39912ad6bc2280bfc7ff5ff63ee58c. 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/KRB461601601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c29d7420905501b8ade66ec09d69c25fa8ff51082123b1506529efbcbdfe1c. 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/KRA922300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e42268055088a1d95061a38d25c5ad46a21713522f5834cac0c46a8786cb68. 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/KRA922300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce894d668748226b54162ba40ca67207ed99a4bbb148e66e0637b943937a0842. 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/KRA922300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b09f7d291356314d2cfac15befeeeb5ba31c0e58b9f95db87685f55f0c1ca47. 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/KRA922300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cdfec5bfedb3437638968c76f7f95782e52c90dd4d1f39efc44e5897c83c259. 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/KRA922300007.
Let There Be Light (feat. BOL4) (Raiden Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97414de6c4915d724a342797756d6084753ddadff47a2c8fba141c0dc29c232f. 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/QMFME2476087.
Let There Be Light (feat. BOL4) (Lame Impala Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245ae1576d5f18b8b65e663d82e1b5f02786c5ed07927204f2d73d37a4ddf933. 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/QMFME2476088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6225dd3a72a4dbad0c6e6d7f2bae5126fb6d83d2a472364a626f6b616500073a. 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/QMBZ92406980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c55d02d79e8a80b88b9c57cfbf2e625b388521dd814d3d5222df6f45b2c823. 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/KRA382001423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde683c64e92dcc738224b573697ca4446ec32d52fde7889324c5e3711f05c02. 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/KRA382001424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf775cf0575e6090b5a1db4a9561775c74506ffdec160e631976dc592cf7ca7c9. 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/KRA382001420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a08556a32a599ef76ee6a7a47c4430a955afeff03d5fcb605fa8d3bbd12f79. 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/KRA382001425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94de21a117ecdd019afbc267160b32613a74fd9dbca86cec1d79242b43996b71. 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/KRA382001426.
Psycho, Loveholic [THE SEASONS: Red Carpet with Lee Hyo Ri]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8023c6f405dfcd3487ab296094f5661d82302a04d6f56cf8fcf90bc165939e4c. 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/KRA492400548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6afb26e48bcf3a658b07b91fa74bfe0bbc950e4ad15f2769102df6874ae921. 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/KRA492400550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde85248f35bac93cb74acd7105d64467e6f25f4170e963c0b50322c55ea55083. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZF452010466.
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