Per Erik Hallin (born 7 January 1950) is a Swedish keyboard player, singer and songwriter. He has worked as a musician in many different contexts and in different parts of the world. His music is he
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 0xb8858f894563329af56511361cb0273ca93f771922da6e50571c0dcb353594d7. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/01808aae-fb12-4fc7-8e85-27013473189e.json and https://artists.proofprofile.net/proofs/artist/01808aae-fb12-4fc7-8e85-27013473189e.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 0xc4f45119c5223f0cd416ea70ab3ab784a93632a9fe444ff9a5d8c5147bcfe837. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QMDA61538536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd56a1b27d31a9eb1b1e477fc5c587a21bf208fb2aca58e8493385d81437922d. 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/QMDA61538537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3522ed0c2ccf18214720836df05e0a3c6bab7db42bf21d530b04efcc2488a03. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QMDA61538538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1592545bade5907dc97e16a84cf1be7992d8cddc6956ddefa4ced72b8832eec6. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QMDA61538540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da0e207348d53921ffa7931a809a353c51344110e2ea7646cdd306d06094082. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QMDA61538544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ceb5c0e82a374978aef22892e9979402ccc10e74eb315b3e762a239e560bc9. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QMDA61538552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650754fd7e31be25513c08f7dcf68032fb403c11dc10a4f5a8820abaeee278ff. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QMDA61538553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6107fce90b3050f589c65f9eed5107d94f915e9b3f8c3ea63de8f394211c177. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QMDA61538554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c70d7ad360d293f9876556f58f308990c187644ac104ba354203efc7a4c893. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMDA61538556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4f8e17db87a1793f269300154b68e584f3d4f535e007b657eac0d72416f32f. 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/QM4TW2023081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5bd4e2d287f38831a49dcf75ad502e4868a3fbae5ba1a7b6beba045cfc6b48c. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/SEVPA2200601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b66177fc579f3a2e332bdc5699b9e550d5a894d528407186983a1010bf3d2e2. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QMDA71596745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81413d611abc1aa8d339f674d40b8bbc78cb97fe9e8185079fabce4965092dd6. 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/SEWSH9900103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08df05fc144248eb2318369a5d1a94129f0460cab496cc23668ee2dffe033f87. 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/SEWSH0600203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6401eb80b571516a4fa348655e8d7bc641cfd6c6b77e119f86bb6d104b1f2b. 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/SEWSH9900107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd45369f9f84b00bc6c3e69c80d67f82ffa28bef675fe3a70c04008b55f1d5b3f. 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/QMDA71564137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6311caad96784eb6a30d1b286d7a902b08404cb468e357ca88c550e5def69bef. 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/QMDA71564149.