TO1 (; formerly known as TOO) (stylized in all caps) was a South Korean boy band formed by Mnet's 2019 reality show To Be World Klass. The group debuted on April 1, 2020, with their first mini album
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 0xf9fdf95ee68bcaef6ba3b70d9d4870ad7bb9409e40183c33ec30a38a17896a61. 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/638099e6-86ab-442e-858d-d9a90c453f7d.json and https://artists.proofprofile.net/proofs/artist/638099e6-86ab-442e-858d-d9a90c453f7d.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 0x6b0acfb8aacd8edcfc03a28e1bae620be135f6da0fd7b50d286f7d16e19bf642. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/KRA492100589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf066ea482c577a2172abcdefc9cdae652983e679ee2802a45f08475ade963508. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/KRA492100591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30b7f2817a0a9253cddfccf48fb75a853b4812af55d0ef4d527d61533ef8ee2. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/KRA492100592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25d98dbb5ca9d5288112ca8c45f2597eeb308399e56307f42b260bc70095222. 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/KRA492101153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253a7fe927b7154a59b96669671e3e82571804c9494c576bfc3eaacd4dd9f566. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/KRA492101148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90470dc47f505105a431805fd089b620ef8dbed4a75ce80002b94eb053592daa. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/KRA492101149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51cb0df270559d298ded7f0e8ebceea6b560aaa16eacd249b36c46bbfb1de836. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/KRA492101150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a6ca89131a1888f0aa8ed58235c110c74a447cda7bae5bcd3ed54112d0ac1f. Chain 2 (Bitcoin): anchored in block 957703 (2026-07-12T12:26:40Z), 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/KRA492101151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4035ac295579fd9bf4ab560f661ebdd57aec1268fed21f9a7222a391dc0d6657. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/KRA492200710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d6a4bdde83198fcca33e722064363ebc5378d493f0f854f2ce221d0ea0b753b. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:55:12Z), 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/KRA492200712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ebeb1c85c31e4d7c7cf2c04c369d06eefcbc94c532d4733f67b3f6536558f4. 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/KRA492200713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e59fe14e463759890b7220a19596bd7abfb5132c6f23eaa24b6bb37d0931c6. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/KRA492200714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc39ce2788b345abb62772205e0297f651ccdef6adc9b3817ae47f02f0ffd25. 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/KRA492201159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bcaeac79e29f5a1a15bc7570fe8623ef25c3c446c6edb01d4aea97cc3c86cf3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/KRA492201160.
Love Catcher in Bali, Pt. 2 (Original Soundtrack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe320f7fedbe80777cb399ab0905a907e506d41784ef3b97baaaf948bc58ec652. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/KRA492201249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dc93664cb02d9e3a695a69b88c0f7a623249309102cecbca3686de441eab47. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/KRA492300226.