Martha Hill (December 1, 1900 – November 19, 1995) was an American dance instructor with wide influence. She founded innovative programs at Bennington College and Connecticut College, and was the firs
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 0xb782d4da3ca5d316532ac031181debbcd75dd86a7883a96b82516284e78ea6c9. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da8119fc-0238-439b-a6f5-2cdd6a578b70.json and https://artists.proofprofile.net/proofs/artist/da8119fc-0238-439b-a6f5-2cdd6a578b70.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 0x09a4c4654cd947714011c4098f80b2272f6f43e3b8517b2d410d972d4b3f58ec. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/UK4MC1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5787d24dc21fbdce1b8a0e824a0ef9a5764f8fc67a80ebcc9f43d4b4e2a7c8. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/UK4MC2000153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa183b5d3c45cdfd5abffca477a17448afa03f2c6f7e28cfc328e2cc5650762ad. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/UK4MC2000154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c72279e6cfca81f8cfd1282c0e806289b41d8974690836e0e62fcda545e3a58. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QM6N22146848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7470c01ec04af4dcca72d89580ef482376073577b5b7275cb4a6f988ad7eda. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T05:00:52Z), 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/QMDA62166915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511c1aa51a3b4c8b860915b139074d5d730491b6801abd820c5a817149bd9076. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/UK4MC2400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b20376c390d50287b04c04fa8e1bd832860eedcdc2c2ca340bbb19e5bd5746b. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/UK4MC2400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d9f183ba5af1ab48668b0b7fc17cfb7b6a5ccfda1bd0c2c56063563b2d6f99. 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/UK4MC2400111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec06837149715c88f6674c989306dd161142867f05e977687b83da32c4b11d68. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/UK4MC2400112.