Mark Jacoby (born May 21, 1947) is an American musical theatre performer who has had leading roles on Broadway in Show Boat, The Phantom of the Opera, Sweet Charity, Ragtime, and A Beautiful Noise, am
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 0xc47fe5090779bc15803dc78014bf5ea67a1273253c9f7659bb6afd4cb9ff1bfd. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bbc4f5ed-b650-439d-98c7-334f9174a9a3.json and https://artists.proofprofile.net/proofs/artist/bbc4f5ed-b650-439d-98c7-334f9174a9a3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Loveland (From "Follies") / Getting Married Today (From "Company")
Sondheim: A Celebration at Carnegie Hall Ensemble (1992)
Sondheim: A Celebration at Carnegie Hall (Concert Cast Recording (1992))
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 0x68863482caa572b5745c69ef331b6e4ada1f1325ca9f16520928cbdc7f4bcd5a. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USBC19200631.
Original Broadway Cast of Ragtime: The Musical
Ragtime: The Musical (Original Broadway Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbd873157a9c01931a95afb4c614210cc3d851c71a460ae7f2d4e57a46e3f4d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USBC19800931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f48f9925a44edcee5ff63b53e7dce4e62e715e2c4537949aa3ca5f8b12f5294. 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/USBC19606894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0d05cca82f62d754a02b89be81f2c7d92415d44776776067f2ea5d802a4155a. 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/USBC19800947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa2e18a887e4338177a9927d407e3785cc3ae9af3888a7b4fb9d2607b1fa1e45. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USBC19800954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05297331582748965d5f37a3ee6ce6f828766e9d9c8393538e073f29a2b49362. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USBC19800956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4217b19b275389207f44c61dad42c3b17540e08f13cb2691e2ca57955232a3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USBC19800963.
Man of La Mancha (New Broadway Cast Recording (2002))
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34aa122870c6cc0e0ac6a04b9ad36810a77a8220f0b5c62026d87681fcb15712. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USBC10200790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf571fb29e596123d14f663646f0626c58d2e0ba76dda920671c1798468b24d87. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USBC10200791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24eaa20f2f5d024672524276a24a4d01e9595fbf1487b2a94305cf36e891392b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USBC10200796.
To Each His Dulcinea (To Every Man His Dream)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a77a62b6962b923f3cde7f9cbb3cd08171d572b6380286457e115fbb338e46a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USBC10200797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde01d767c4e8c0ce6c941fd56742768d5aaa05adaf63129a037c710a5766fd48. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USBC10200803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549bdd33c57019e9f9ed941918dfee39e01c43a593cb478486810a4d1c3c1d38. 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/USBC10200808.
Show Boat (1994 World Premiere Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277119d439478ce324d4eb84ede0367276e9010bdfada4f5eb90bdd4e9d29bc0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBDGA2307018.
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
Waiting for the Girls Upstairs (From "Follies") / Love, I Hear (From "A Funny Thing Happened on the Way to the Forum") / Live Alone and Like It (From "Dick Tracy")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2481e34692d15af0e44336b0649cf2ebf79c6d6c1659e5f2b3646cafc4d4e146. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/USBC19200632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c5cfd23049ab5777ba75db36b13c92dfbe33d6aef3088b6383397e38793eb9. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/USBC19200623.