Gustaf Allan Pettersson (19 September 1911 – 20 June 1980) was a Swedish composer and violist. He is considered one of the 20th century's most important Swedish composers and was described as one of t
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 0xe77b2d1e4ce0f97309613fb6b6bf2f126c7ab952e25d4e7c1135d2bd489d274b. Chain 2 (Bitcoin): anchored in block 953714 (2026-06-15T00:43:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/84d08540-07df-4e27-934e-da53dc9910de.json and https://artists.proofprofile.net/proofs/artist/84d08540-07df-4e27-934e-da53dc9910de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pettersson: Concerto No. 1 for Violin & String Quartet, 2 Elegies for Violin & Piano & Other Chamber Works
Pettersson: Symphony No. 15 & Viola Concerto
Pettersson: Symphony No. 12 "The Dead in the Square"
Pettersson: Violin Concerto No. 2 & Symphony No. 17 (Fragment)
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 0x91b2414a12972ef400227d0aac65e3b6d52af2e8ec6e0239c3955b0fd03345b4. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/SEAEX1740020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b268afa6dc500d40db59c849ae418739f852a566065881efd4f447861fa6c5. 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/SEAEX1740080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1993f16395e39b3f3f26471a45b0e6b8ab215d88d6f6ac31d9c0e7059cb8f089. 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/SEAEX1740100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fbe317df56abf0c59a0daa1f8863173f4d96655bfd799a14168085a86d17a7. 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/SEAEX1740110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf290c0522b53c33b90e973d94889667e0654e80c715be9fa8ffe0350b8d7d12b. 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/SEAEX1740160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x288100603f6206f89c0c072c03b7f6300b06e450b05bd9a7da37881295ec2261. 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/SEAEX1740170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd928a9c6f8e91c9c697a5be5dfe90fcfd8c20236e37d54c3ba5bbdf364f16b0. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/SEAEX1740010.
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 0x1b1f26aae1df056e3d5b2dee84d6b5ad512bf3a74da46a1eb508d532417e5637. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/SEAEX1740030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73de2fc9b7df7888e80cd1437c20c3fa9dbf51307d238a019e4e3c94e8277559. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/SEAEX1740050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4594d24b8d4f5e12c26dc9f461bd14d2ccedd1e3e886f7d2e1330ed61fabd1. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/SEAEX1740060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ad1be31272f82a40dacb015ec99dc5d00fd4a3396743f08b4e3be7a4394af3. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SEAEX1740070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb8f107d3d960e6d26e619804c0eaf6cbdc6983d3ac33482df70404f4400e402. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/SEAEX1740090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47981afadd2cedcfe25377f612c2b9bcdaed472dd6a3d02a1b9e0a12c82fd16b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/SEAEX1740120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0ddcd3f547fd1fdc74a9dad091de35fc0cfb0a5247ce9bd6e94ac5328ebb95. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/SEAEX1740130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f9921bd1c383be608c2e80da52b52442bbfcc378814ab4febd6e752187d4ff. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/SEAEX1740140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1738c614964d9898c895bf318a8b7774ab560be122d9f8b315a4cf901801ae. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/SEAEX1740150.
Pettersson, A.: 8 Barefoot Songs / Concertos for Strings Nos. 1-2
Pettersson: Violin Concerto No. 2 (Revised Version)
Pettersson: Symphony No. 12 "De döda på torget" (Live)
Pettersson: Violin Concerto No. 1 & Chamber Works
Pettersson: Seven Sonatas for Two Violins
Pettersson: Symphony No. 2 - Symphonic Movement
Pettersson: Concertos for String Orchestra Nos. 1-3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb00b261d94ab211a90206b79e45dd1645fd28f9c2b4207c8908cc18a1c409f20. 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/SEBAC6901010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c416efba8a13628a0240e4e7335dfed5f5b2228a7c9c683ca98f43485853350. 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/SEBAC8501010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7cb19e8c19911b864c5818d09d5db617d6a3e9f2c71888d2fa591d3b0bdd46a. 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/QMDA62162312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf94e1f46d18824d0a7c322251a9a0203794d7cfa3904ef9527aee787046443. 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/QMDA62162313.
Pettersson: Symphony No. 5 - Viola Concerto
Pettersson: Violin Concerto No. 2 / 6 Songs From Barefoot Songs
Pettersson: Concerto for Strings No. 1 / Symphony No. 12, "The Dead On the Square"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbbc679cd6f6e91da9c0c5e4fd3a02ed4d6e091765d8196a56ef82e55524c93. 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/SEAET1280010.