Lõõtsavägilased (English: Accordion Heroes) is an Estonian folk music ensemble founded in 2014. The members of Lõõtsavägilased mainly play folk and traditional music. They have performed at all major
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 0xaad091df1438719de9fcdcf037fbaa66d577950f8db13d8f689ffad568bc54d6. 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/853859e5-dcd7-4266-b403-0251320c91c4.json and https://artists.proofprofile.net/proofs/artist/853859e5-dcd7-4266-b403-0251320c91c4.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 0x35536f7140cdf27a63f1a45f4b06c9f3df414e9e538c2ee584226dfa813eae78. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:04:45Z), 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/EEYV11500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a652c7749538a019e3ebf765be005959f4e6d79a33bf35570a1565d8fb3a89a. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/EEYV11600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad51b4898094b63e0d820afb3edc01a75baad71b786af5c903d28097211bf801. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/EEYV11800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6218b92437d190551e4bb86c75256dafbc94c99cfd5083cc4353b4049bbf5f5. 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/EEYV11800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140416be7f47a6e3cb81420cb46983e01342c3c934ffb8fddd89f19dd77149db. 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/EEYV12400001.