Kol B'Seder is an American Jewish musical duo formed in 1972 by Rabbi Dan Freelander and Cantor Jeff Klepper. The group is recognized for their extensive contributions to contemporary Hebrew liturgica
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 0x4ea58c4143cdc145d0a9c6e3f5631ddb6aefbac02288acd2b3605651d524a061. Chain 2 (Bitcoin): anchored in block 954502 (2026-06-20T05:07:36Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c582624-2af7-4b63-a62f-81a4e7cfd7e1.json and https://artists.proofprofile.net/proofs/artist/9c582624-2af7-4b63-a62f-81a4e7cfd7e1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Songs for Growin': Jewish Music for Families
Snapshots: The Best Of Kol B'seder, Vol. 1
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 0x151a9ea1970ff0d2ba4b3ddc205b108e85b0f5aaa5d1e8dc76a327cf3467f7ee. 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/USHM80780270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6776c65c6f63af55bf537cf848c5ef0ff504eb09e4aabbe9bbbd7629f921da. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:25:08Z), 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/USHM80780294.