Double S 301 (SS301) is a subgroup of the South Korean boy band SS501. It is composed of three SS501 members: Heo Young-saeng, Kim Kyu-jong and Kim Hyung-jun. Double S 301 made their unofficial debut
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 0x5fd671ad30b3b33db167aac22ecee11a456c81ee3d1c4b09016ccd9328d2171c. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8769a9e-1cdc-457d-afb7-a68a984e8c1b.json and https://artists.proofprofile.net/proofs/artist/b8769a9e-1cdc-457d-afb7-a68a984e8c1b.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 0xf4c8cef50f112cd2dc7f919a591627c37be7c68edc0756e73deb74c767acc661. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/KRA341608471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4200f0b622ba193852ea2e3cb8e65dfca60796810ea87ea3d6ac025469e67678. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/KRA341608473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa603d764d339e2673dcff3cb3ea8585334753e6ed919955efff2e070527f7bc2. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/KRA341608474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650c1f2895e83f9dbf56841523510cc33c47964ca0eea0a90c736812139e1773. 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/KRA341608475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ae41aee2c6d763b8726a257a861ac01e2556337cd4628627d11f7a7c7d7e1d5. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/KRA341600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5349e852aa9101f011591ce27399c0e65c3828c266b63bd691619b667ad6d9e. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:52:36Z), 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/KRA341600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa490eed1f6f5e1df6408c978a3286096955de8f0e61ba5749c9f449fba03b455. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/KRA341600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5ec10b830324e264998b6cee0b58a64d98dba6e4daaf07c11353aff2d0d496. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/KRA341600005.