thumb Matthew Sklar (born October 7, 1973) is an American composer for musical theatre, television, and film. His works have appeared on Broadway, the West End, and theatres worldwide. Sklar has wr
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 0x786df4bd7252f941007abaeb1f5d4976a4fc062958ea090d1fa966fc959f5a8e. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27801883-3818-4a03-a756-59ee8b278dd2.json and https://artists.proofprofile.net/proofs/artist/27801883-3818-4a03-a756-59ee8b278dd2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Elf: The Musical (Original Broadway Cast Recording)
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 0xae46f6ed220b1d83f3ecd1a854e2e4c603cc8aa01a60515b67bce59e70ff9dcb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USSK31192921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03a1b9a7b939be96190fc1d277da133507a2bc4f8d5e0465e73c684467586dc. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USSK31192922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d7610aa1759c3ab5dfce1d0ff20e4c3b55af54221d0026c141f265d7d450d3. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USSK31192924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1136d3ffaf4b3a248afd44c65c0871d66055a57063b8959811671b355f206863. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USSK31192926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56ab4fdbecb81b61fcd6276b24cedfa85aeeb4e49e23ab1d3beceea9e466cc7. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USSK31192927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e36e5a0df928e5a59e945301b4f682eae0492fd7acf087c6b4882f4eb8fe28f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USSK31192928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4acbcdbec75e7ba17457f408a904fb36fdb06118e34d0e4e756b41cc38893ee. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USSK31192930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe443d3b962c780ae8f742e2967f7d0de75a1548f7334029573776911b175a43c. 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/USSK31192931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc761263462f69b491d40a236ff5ffb392753ec25e3e6c69ecbbe91de14604879. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/USSK31192933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ab45f89911e08a80ad97bc931ac5a4e35226e0697cca3d2bc18fb5248945c1. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/USSK31192934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb233a9fe79f4890dd722068984d76f0cd35d38c98047e6f5118c7267d3d464d2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USSK31192935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02a831b37452b564fea3f06adc5a7ce3f2b1711f011c5b651903f271363c41c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USSK31192936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5815edd10b24189c4e7b4db89e1fef49a87a63edd051734b29fd9751485585. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USSK31192937.
Fiddler on the Roof 2018 Cast Recording (in Yiddish)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7a5c8eea0ca9cfb0413aa202516da90f8995e8e25ad3b2232c8666eead315c. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USYRC1900103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94771230100e0d88baa70d39029dfdc093f708f341cda89715f734feec817e10. 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/USYRC1900105.