Ryu Sung-min (; born February 28, 1993), better known by his stage name C Jamm (), is a South Korean rapper. He released his debut album, Good Boy Doing Bad Things on July 17, 2015. He is the runner-u
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 0x9ce8e86fb834b277438105af9c8c207d07fa99c115f297a3427bf8b154d89555. 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/24996e7d-7275-47bc-bb88-e144bc08a227.json and https://artists.proofprofile.net/proofs/artist/24996e7d-7275-47bc-bb88-e144bc08a227.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 0x36297c451627b5734b2e74ec6f50790a1260543f0984e506646b524b6de91176. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/KRA491401772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d3266103a7719c26ae8e83c063221fadeca22467d622e2d47ef802f4c06d70b. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/KRA491402520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34fc549153accdf63ffadefa7951549d4682e250bf23840ced6c700b661970b. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/KRA381211133.
(Bonus Track) Just Music Remix (feat.VASCO, Nochang, BewhY)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae606122c0b39885529cdbf3dc6cee05ee188bea3692aee95a55091ea0ab8d48. 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/KRA381211145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd927246f2964d9fe139aa357e2e289dee288379d90961390174aa294bd3cd1d1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/KRA381702069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d27d8458bfd6f983b5195bb1c311703558e972778161a8093fadc721db5ad66. 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/KRA382001159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553c707235fb9248ad56e4490a37455312c5ad774200ffd9ee7ea6084f09dff1. 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/KRC712000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4416753d11c75e27c4a4bbe4501b89fd7ebeecb38a69afe0b9b848f6cc998047. 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/KRA401700027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0179e334f31df8f9c4bcb9b104b2da6e63abb522e4fc34982f7283bbf9a81818. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/KRA341519778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ed2e953915404dc52da2cc787df28fab63d2e29ff09c78ae2e62148b399272. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/KRA341417474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553c707235fb9248ad56e4490a37455312c5ad774200ffd9ee7ea6084f09dff1. 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/KRC712000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c13ff0a367cb78453f59ca0d46af26b9551d6c3afa33bf1ad88b011238865d3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/KRA341512935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44974a53a25394b2275e7eb4706a27409eae4d9eba2c96742febeff2a42e26b4. 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/KRA341608130.
I'm Sick (feat. Kid Milli, Lil tachi, Kim Seungmin, NO:EL, C JAMM)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc49120571d45c2a9dc7d16fd215c5136607117da1d1e93ec037fabd4b22abb0f. 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/KRA381903240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47e48c0c2533813e3159daa9520db2954695603c120f42df01f41c7c89d6aa5. 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/KRA381209910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8eb63acf60e1336ae8a9d9bec0ba9b4e6a9c16497c6bb7e162473e6dfb2c00b. 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/ZZA0P2405354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecca7afcc2052f8d6fec382de65b7d57c47bfa2049e21d442021494a9d8bbf0d. 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/KRA381900420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94357aca94a94962751b8070d2e1373bb3fd33e9ad2b0ab16c9b9a54051b11a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/KRB471500172.
88 Remix (Feat. C Jamm, Olltii, PSYCOBAN, WUTAN)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53fb81ddba1052bf679e615b6d0929c70db6a03577de9f8a02fb93873c2a18a7. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/KRB471400337.
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 0x2a7a8a7ea525bb0e848fcf7076c79cbbc79720a111f948ec83581e00703897be. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/KRA111500117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cf57d9e427beaa3def64f24379b1a3e2ac90d1a3616838e69eec1cbfe9a05d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/KRA382000572.