1TYM (, pronounced as "One Time") was a four-member South Korean group. They were Teddy Park (also known as Park Hong-jun), Oh Jinhwan, Song Baekyoung, and Danny Im (also known as Im Taebin). Histor
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 0x6d7d0d1ff46083808a5ed8d993890bdeccc97f8eb28dbe56aeb4eaf073e556aa. 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/9ff68ad9-7e7d-48b7-8f81-4df64cf286ae.json and https://artists.proofprofile.net/proofs/artist/9ff68ad9-7e7d-48b7-8f81-4df64cf286ae.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 0x96e0f914bbe1156991eac925a90488f56cb08650a82ae06662a93fb81f2ad57d. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/KRA401500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9507d9a0ef96ed06b1889ebfd13d26c5a64103d4ac12a211cdcbb88204e98e. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/KRA401500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1a3d80904f5d83b62c44664a06ab7f35eebfd22e4f88d5f41ccf2610786bb4. 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/KRA401500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd049b5ca14ebc985e45a9043a90d57fb880a3da5911ecf69aefa6cf5ee164113. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/KRA341508865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe35db489abea3cb46af92300ce8637309ca49c703c66de3a70cbd49ad3dda0. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/KRA341508868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54b6329e44b8f5b3ea61e1b04b6a65570efb96c40cab42bdf83e0f7f5caca65. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/KRA341508871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa049e7cf0092cbc51d5fdf0e4fdc51d1e62edc42954629e14fcbc859d8bb9891. 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/KRA401500170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3142c9f855ba8918bca7b36c00e2d1db4253c433ddf3a7c2022d12400ba203f. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/KRA401500177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a3fdc0b1b676bb97ccac22b8b918b48d09ffe1d0e03c09158b853465f0439a. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/KRA401500181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa67a4cae4a528ee32673bfe5d418f57f13d743087f5449e5cd1d3caa6807ffa6. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/KRA401500349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10f3adb63e0c6682fcad54cad2bffe1fc45ff6642314632ba9c34b67dcb377e. 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/KRA401500350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21dd3d39a1884b2600b6915220f29bc05232cc5334b63137f2ad733d0c35dad5. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/KRA401500351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0352f84c41c445bf2bf06308478f67b6c3ec0dbc703920989b3f7ea6543e7c7. Chain 2 (Bitcoin): anchored in block 958724 (2026-07-19T11:19:01Z), 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/KRA401500355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8a71a0ddae1a62032b89e126be18bb17d30af5d3247493f2443a829ffc69482. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/KRA401500362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21f3daba3cf10fca3642f3fa01d6d2b695f92f96bf8ddbb696fc719506074abf. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/US3DF1836956.