Retro Stefson was an Icelandic alternative/pop-band formed in Reykjavík, active from 2006 to 2016. The band was signed to Vertigo-Berlin/Universal. Retro Stefson released their debut album Montaña ex
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 0x70d925f55bc19fb01ba5152c7d68f6be264a72a3295322e5675e5f607307be29. 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/3598ea64-4880-45f5-8071-135195bcbf10.json and https://artists.proofprofile.net/proofs/artist/3598ea64-4880-45f5-8071-135195bcbf10.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 0x77395b04a25b8bb7502c058f818770d206fc125805bdcc74c3b2053e04a2854f. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/ISV341001502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0f1a104c3317c42d39cd8d8a4075fcfb2cb392421a0bc22c5128011a57d22e. 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/ISV341001505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6654a4f0f5f1a18b58f7165753d79c46aa9f75855028d2a1a7e53546f75ae0be. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ISV281200704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0948b935b0c5acd7db327357134e5e8ee3f1836263ab7713b3f63be00af3fa26. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ISV281200705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa188c86503c532ba3fb642b1b7137da1b0c714d91eb43a92c9bad4cbcf4f3bb2. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:24:57Z), 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/ISV281200707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3abc4e3731e9322cdcbb7d69bedcae405b82801e754d28f9e5c001072db97a. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:11:16Z), 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/ISV281200710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953b3260a310d4c353358455c898903b8f9968b59bdc1bd77c8708cfcb0b1940. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T08:34:31Z), 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/ISV281200702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953b3260a310d4c353358455c898903b8f9968b59bdc1bd77c8708cfcb0b1940. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/ISV281200702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f292de474417f2188fb0f48abcf59d7c4816c50ce93d3c0ef232f2acc85798. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/ISV281200703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ab1cbafa15168df55fea32f96047ee5cad09c0562db7c517b6bfcc5668808e. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/ISA111501501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95edf5e8bb29d9cdf70ab92864cee1b1a93cdb567422a44aa119c94cd0d5ac80. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QM4DW1681908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7383ed5992401d39e00e8d3211fd6585895e7bcb572145be28edc9d41cc3d7a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBFBC1301041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2735f4467b8f8ab891334c4bc93f9951ad5d329bbf7241020f5a522cf6bb2f63. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBFBC1401204.
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