Madeline Gail Kahn (née Wolfson; September 29, 1942 – December 3, 1999) was an American actress, comedian, and singer. She was known for her comedic roles in films directed by Peter Bogdanovich and Me
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 0xd36d9044dc30275694efdc5d9920e2890e5b96070caafdac3695baf33296850a. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7798d8a6-c3ba-4182-87c9-ddc90b7cc4e6.json and https://artists.proofprofile.net/proofs/artist/7798d8a6-c3ba-4182-87c9-ddc90b7cc4e6.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 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 0x68863482caa572b5745c69ef331b6e4ada1f1325ca9f16520928cbdc7f4bcd5a. 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/USBC19200631.
On the Twentieth Century (Original Broadway Cast Recording)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5708baf5408237f322660e4fbf4e4a7b8baaeabb0df4193f6d0e2911eaf0641. 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/USSM10407398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001fd5d6453042533a4f14d5a2940bc5344895561675a2be4ada99fd1cf7eb44. 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/USSM10407401.
On the Twentieth Century: I've Got It All
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce1bbd9dcbb1d0de2770b34a346559784b43f1af010a3b7c95e6e07a27670045. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/USSM10407405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x239f8dd73c7d2052f6433954624f9d6699ca23b3c4a1e6b98d6ff1b2f959bc0f. 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/USSM10407409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4c47fbff6e7d107a61dffe966c26001746dbb6bfe76025fa02efb226803ddd. 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/USSM10407411.
Anyone Can Whistle (Carnegie Hall Concert Cast Recording (1995))
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e3a80c8576d1454763b5461347d10ce3aacaaeb4acb21a35e06d999fe382d6. 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/USSM19500240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109aaae42ee6dd13ebebdc7b2fbb267b6707e45167e8eba81ddb91411f78d716. 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/USSM19500241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29ffb65020d9d7be68cd0765961a483c2d7fd9972b558c47caf95c8c4868b50. 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/USSM19500242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x173f2c3deab5d6400d3e955fd600a55fa6504ec9f5f13921ecd5fe8300d24a32. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USSM19500246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf71659baa8779f304b72701a5e5fabc9be75934ae2ae06810353f67386196396. 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/USSM19500247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e61d3822243789af02334e27d5ed0fd8bc87a3e13a1f08feee63d943fe303b. 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/USSM19500255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af09f429d3623a235c3f1fd6a9a6effd7ad67d9ef556ac1172951893749e0b9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USSM19500259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16bd1b6801b525332ee2bef51fedfceee4ee42479c2d41cb540c47f46f010add. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USSM19500263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38dbd989ecc23430ee349514366f2d3379843e07bff447abe4721e95c1b3325c. 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/USSM19500264.