thumb|Thyrfing at Wacken Open Air 2003 Thyrfing is a viking metal band from Sweden. The band is named after the royal sword Tyrfing from Norse mythology. History Thyrfing was formed in 1995 by Patr
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 0xb7576a36ff67d18013fc0b87335f8b1122a72cbf088d6e56491c88dfcf3e5a87. 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/495a37e0-d1e9-4bdb-bda6-483b67e4a3f1.json and https://artists.proofprofile.net/proofs/artist/495a37e0-d1e9-4bdb-bda6-483b67e4a3f1.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 0xc28dd2e070604655f5141bbbdd5a84af224b9a5f09b752de6b6a477dca16bb9d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLKRM0903601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ca8930203bfa1d7e301d4bb2cffffc86c727f95cfd9927f22edc5d470a640d. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLKRM0903602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5381941430e1d07cb99aa35ce9b63a556062bbcaf34df3c692022fe9d70d60ff. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/NLKRM0903610.
Prelude: Heading for The Golden Hall / Storms of Asgard
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe1e736ed144c24c3704dc7b70abda04a148def758f613cca1ed609f351e43e. 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/NLKRM0804101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab48ab061482b51fcfca321e7b2637ed81f0d03f9aa3c4217b5e4a41e86790e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/NLKRM0804102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4292b82d5812c622cec51bc471c1fe94b0e7738809fde882d4db453d631aa230. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/NLKRM0804104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a78d2f2bdd32acf5022f8a2b02d797d294aaa298ce8fc54ed9377704c22564. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLKRM0908302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bb6c2f0b1b9e1510b6441cc0ed25a679e05242574f93f24cd01c9c004ed061c. 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/NLKRM0908303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0380398903c29198e8f5f30a04aa0ca22ad7bef029764bcc9b75a7205dd7dfd3. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/NLKRM0908306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d322484a7d53302280d51e944e3dc1878aa74fa5bb7bf5e2ce70f821a1cccf7. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/NLKRM0908309.
Over The Hills and Far Away - Bonus track
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348bd2fb3122ca68d1d4c45de6e35ea6727bd4f5aaff794258ae570f95d3f3c5. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/NLKRM0908312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c64e6eda5d96433b3dc75b2190d3d863774b0df84dbc9d3154e2f4e37a457a1. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/NLWJ21206303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c3d7293793a82fa25997bef88e74b5ce8379c872fa542dbed7f8b76a23d8a2. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLWJ21206305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5f7c80563de60765b97a08f6ba8d51c4987dce0da84a5091a680de82c50296. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/NLWJ21206307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe7443be1cdd6bd92cd9187ddd55ed7ebda5a2a4ac6858c6949b30fec881ca7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/SEVCK0509001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15955de0d4d976857789e5ccc595ea64d94bc87e93004e27cf322e0aa5d1e126. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/SEVCK0509004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8996f3326699c6bf3f59e98c2f7e5be5b7bb10197b4641812a6a231853b4028d. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/ATN261303101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b2b0e1fb2343afa1301a815bb870729f03b1a01d25f1ce89d332d2411a5add. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/ATN261303105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5da3ed1b31f4bc1ebd5f41dabbad5455ed27e2b6e2fe9261291b6e555897ba. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/ATN261303108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9e6e8fc7ec8dd4d70b2660124f777f2f859ae2b2775f4e9b45275e15fba8aa. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/SEXTE2100102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0a6a8491df5c2abac5b34c36e21e945544c58a2bf83390945031142acfcf70. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/SEXTE2100103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b42e51e1e66a3fe5fc3399e8354e3bef7db6d7c419aae90837ec10a7913a607. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEXTE2100104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81effd358ce64a7b2654574c73321f28956ea15cc0e60cfcab040df5aa37cf84. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEXTE2100105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496eb4822a89a6619826ece1c9ee0893586e8a81bf0f2ec09c5e699068134e41. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), 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/SEXTE2100106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121114a883f0a21b0f4d689460a2c6b08164c6bfff95c147dc9605df9586bb5a. 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/SEXTE2100108.