Hal Leonard LLC (formerly Hal Leonard Corporation) is an American music publishing and distribution company headquartered in Milwaukee, Wisconsin. It was founded in 1947 by Harold "Hal" Edstrom, his b
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 0xaef2152867ecccc27f218221c6008e0229a9bf4312b12dd0a489ffe9803dad40. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7994a21-6b43-4f61-8b66-9d801d692cb7.json and https://artists.proofprofile.net/proofs/artist/c7994a21-6b43-4f61-8b66-9d801d692cb7.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 0x046791b3561d6cd2ec4a920412b3bc6a335021d6d43ac447720e077e1b02e691. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/FRX201726742.
Johnny Appleseed (A Musical Play about a Great American Pioneer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1aba5406976384976b417e213bb990c406b9ddf88e2f52459b7af4d885a159. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/FRX201761007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc15f864bd24bd48dad51adfc5a33dc16fd36399866a33eb6db256dbbfc205fb. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/FRX201726171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253ae1d9d28603deab566e077a64b563c733d259649d1526c828b3770355a7a8. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/FRX201726172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc488c51837e9efbdb0e7b4911ee65b8be329c472c789df026847393b765bd44. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FRX201726173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27e4f4843a0f9197578fffc8c9f914c31f41da04ae135b216b0f86b490bfaa75. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/FRX201726174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d09bfc4b205f054f7d541f0feb0f64ade02449d1149aa99c540f2560c325f7. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/FRX201726175.
Music of Our Roots (Singing the Songs of Our Heritage)
On with the Snow! (A Hot Musical Starring Cool kids with Warm Hearts)
We Honor You (A Salute to America's Soldiers and Veterans)