Christoffer Kläfford (born 10 April 1989) is a Swedish singer, born in Ramsberg, Sweden. Career Kläfford began his music career performing for 10 years in small bars. In 2017, Kläfford won the thir
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 0x31ca30f326fe5e82c117b4b277c09d082fb9077fede98e2e4199a098ebc2390e. 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/6b65f42a-15a5-498a-863a-681c942b9a80.json and https://artists.proofprofile.net/proofs/artist/6b65f42a-15a5-498a-863a-681c942b9a80.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 0x3c4fa5cf285e32125510625e3091983990272a162e53719e1be6f304f9382db9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SEUM71900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44236d41271fec4cbd4b65425a362593b75a28aa35224a0ce52fbd4aa26401e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/SEUM71900421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7cb3dbc394848d3c2656dad98ed84b55edc3d6ca562d82b10702b81231e6f5. 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/SEUM71701116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44236d41271fec4cbd4b65425a362593b75a28aa35224a0ce52fbd4aa26401e. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/SEUM71900421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4fa5cf285e32125510625e3091983990272a162e53719e1be6f304f9382db9. 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/SEUM71900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f2eca26f5ee0f85744fd989fe6dd4879710cb2ce7766ee7ab3273916d3504a9. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/SEUM71800293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb01a25fbef4c99536d726164d810080d049604987523893ceed68038fdc3bf15. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/SEUM71900419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3450eb9d82f01c2684d3bd576abed59bf42c18c2fe300404e43fb777c20b4ec2. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/SEUM71701119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7340fbbb5dc6684b6739a6fc91dccc533cea8777dbfc31b843b70436a13425c7. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/SEUM71701117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ee20cc06fef42b0217b714befae02ceea9ef06816866fc1f188df76ecbcb77. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/SEUM71701118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5569d25a550f5fc5ae932298701a05f28e08d9f07a9fc2afd953b60c3afd41. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/SEUM72201262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d12280753c2f28a71d0ef399cd1fceab477386ff41c544c975c241a2d734bdf. 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/SE7RI2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bf944036656bd9de818c61077a1540e9d714a4a400c87f8a224fa2b68c973e. 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/SEUM72201546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7cb3dbc394848d3c2656dad98ed84b55edc3d6ca562d82b10702b81231e6f5. 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/SEUM71701116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a474846df1921ec630ce60c131202543e21f739acc3bc6ad5f24da18a35f8a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEUM72000545.