Blå Tåget (lit. The Blue Train) is a Swedish progg-band that used to go under the name Gunder Hägg, the name of a legendary Swedish runner, but after name conflicts occurred they changed name to Blå 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 0xa3a7b53c7d48570b71a3fe5629774316dbee53dd8fb80450bf15813a834e4288. 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/d8a9562b-cebf-423b-bd45-fb51e6abcacd.json and https://artists.proofprofile.net/proofs/artist/d8a9562b-cebf-423b-bd45-fb51e6abcacd.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 0xe46dfd0bb3b718c47e0742a2c5652626f6d39296e28a9b1b965387c1f73d5aec. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SELAA7200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a82f601483952b95a1f34a644f542d61bb229eaa704debef3cc060da2b84cd4. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T16:11:15Z), 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/SELAA7200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685e4115eca24ea026d764959a3f5f5800dd71f8587217d9c205199261e570af. Chain 2 (Bitcoin): anchored in block 958865 (2026-07-20T13:10:42Z), 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/SELAA7200107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0beca863f209fc22514bb5f7ffa62cb40ab20b0fe88fa23c2618abaae12fa2d. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T03:26:55Z), 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/SELAA7200109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79ec0667549a66ee7c59cc34586f0dfad712b161e2ba0c1a975dd7f73634884. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/SELAA0503903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a3a1799b20f26836013ce43fc56405b32992d13af694fb06426a7d928f94b87. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/SELAA7200113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3909f5c6223b16606c1c134d93e189a7aeaafd9e8262cf544f87f87e0cf72e1. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/SELAA0502506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046da2729468cca157b5c9068925ccadcafd09442b54621c33edf569e6b0578c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T08:56:09Z), 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/SELAA0502507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d59d84b06b79c46050eeb017bcb688e623b6b79f58c47eb9218625adeac99c9. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/SELAA9902040.
Flyende vals - Inspelad för Tonkraft 1974
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098317baa98cb572c95a36b21e29ea2b2dfbe88c9f05c25adc5f1919d67e6ba3. 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/SEYKU1506004.
Till glädje och välsignelse - Inspelad för 29 Minuter Hemma hos Kjell Höglund 1977
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ce19c9d54aec9ae7d4bee409c5f31e2f5bffb331de26bddae2201be56175ee. 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/SEYKU1506006.
Jag hör hur de ligger med varandra i våningen… - Inspelad för 29 Minuter Hemma hos Kjell Höglund 1977
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11123649619a77f46279421ba2d960fb0199f8bc8ed7630a4c113285be2eb67d. 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/SEYKU1506007.
Slutstrid i ingenmansland - Inspelad för Tonkraft 1976
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c87326e128bd5a8266dcb0ab52ab665355d7adae2ae3ebafb628b194f348ba. 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/SEYKU1506012.
Under antaget namn - Inspelad för Tonkraft 1974
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c52e2d532a7be5f98956786347c7f71c2e3a5f1f67c0b0dbd6301e810c1e13c. 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/SEYKU1506002.
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
Den ena handen vet vad… - Inspelad för Tonkraft 1974
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc448dfa31509a255997da7df5211e01442003bee106ef1b5bd828129e42554e9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SEYKU1506003.
Den grå eminensen - Inspelad för Tonkraft 1974
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ca02977ef2c1873ff7a59980e198510431f42433f46ce28cec0c074f461ef8. 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/SEYKU1506005.
Progglådan Blå Tåget (Live från SvR Tonkraft, 1977)