Harold Hastings (19 December 1916 – 30 May 1973) was an American composer and conductor. He was born in New York City and subsequently studied at New York University. In his early career, he conducted
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 0x3f5aedfcc2d29dd7ae460d6d9a6c692f7ac7f62e2a50fbffe0689e02a57a2ea7. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2c5fc9a5-e8d9-445d-8ab0-56982c337179.json and https://artists.proofprofile.net/proofs/artist/2c5fc9a5-e8d9-445d-8ab0-56982c337179.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Company - Original Broadway Cast: Being Alive
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 0xc40e7ed9eda73a38875373d7d0df9c80a70a2816adcd0739b1366ee6c146f757. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USSM10112743.
Company - Original Broadway Cast: The Ladies Who Lunch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4449c319b3eaf5b5d047d86ea6d915d16f8ccc7c8bccd5d37307c10006028ac. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/USSM10112742.
Company - Original Broadway Cast: Another Hundred People
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21abbf64d6795239423802628bb5f43133f30f87eb195ef195d648d848f3ba22. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USSM10112736.
Send In the Clowns from A Little Night Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77545cb412f3f02f7f5b735790b04c4fa76cf3d262aa1b1411846278f73ef334. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USSM10407069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38631ceeff8a37a6be291101da6eb92688e8ed66dd8933d9ee350503cd7c0767. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USSM10409906.
Company - Original Broadway Cast: Company
Company (Original Broadway Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a96fd52ccc9f5323be1ad9284af305a176c58f2a06d227eadcd7bb7266a6c3b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USSM10112730.
Company - Original Broadway Cast: The Little Things You Do Together
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5747a1dd56d3e8fbe3d810e97fbcf7e928a3d381c88fe7839fa00b3ada19d1df. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USSM10112731.
Company - Original Broadway Cast: Sorry-Grateful
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2e72f5a11dba05317b9a48315b2963e63ff34ecf26c3e4bac90a42e7b9e752. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USSM10112732.
Company - Original Broadway Cast: You Could Drive a Person Crazy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aeb91aa1f5dd3ceed8e1d21d96ccddb32c2ac162f19cfa47349696117484040. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USSM10112733.
Company - Original Broadway Cast: Have I Got a Girl for You
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe66226b230f86131df3e9eb45686fe36cbf28f32ecc873abf1c7522092f735c5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USSM10112734.
Company - Original Broadway Cast: Someone Is Waiting
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eaff3b55cf6df737e78c22941f5343529421e2cb08da387ddf6e35e1022e942. 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/USSM10112735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21abbf64d6795239423802628bb5f43133f30f87eb195ef195d648d848f3ba22. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USSM10112736.
A Little Night Music: Send in the Clowns
Original Broadway Cast of A Little Night Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x530686fa418d980ebb6ed3b41e70ef6d0b6d0091c0972acb4ac94dc66208f478. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USSM17300275.
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
A Little Night Music: A Weekend in the Country
A Little Night Music Original Broadway Cast Ensemble
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c399008c40c1bb977c35961f8c2bddcd74e13d0a2235e2ded46fe38968095e. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/USSM17300279.
Send In The Clowns (from A Little Night Music)
The Party's Over: Broadway Sings the Blues
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b1a2e2ca7401bab988028941c3e32ad5aa8e81c8257955bf75a57abaaf5b81. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USSM19304036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8b7083db37fa7b470679c93c1ff572f573cbd26e01862fcc083da0f991d96de. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USSM10407068.