Stefan Grossman (born April 16, 1945) is an American acoustic fingerstyle guitarist and singer, music producer and educator, and co-founder of Kicking Mule records. He is known for his instructional v
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 0x621ff23c73dc04e55d25210fb2c945fd69e38402d85f982556776c9860331119. 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/6d352002-7db3-42ae-9cfa-a622900da86d.json and https://artists.proofprofile.net/proofs/artist/6d352002-7db3-42ae-9cfa-a622900da86d.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a4f1a2dcc771c797ed7a6e18ff9bfa3b9958b346ea75b0a7e362f75c059224a. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T19:08:25Z), 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/USA560560090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac1e7e497ae4dd2a05a84e4fb57f52e8c5b4954d395784168d43a78ca5ae8ee. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USA560560091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c85c48e2ebc4c406dfdb4fdbbeab104589239b640c62702d62b4bcf40dd0dcc. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/USA560560106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096a916529cdd5e95ad00af7c6a9515ee77478d46d728ac7240a36ae1f107dea. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USA560560119.
Kpm 1000 Series: Blues and Ragtime Guitar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c077786d0e5bf1d190dd7de239667b59029eeb379ef5900bc4a4e110777b4c3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBBGL8500115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956042d812d0d7074f2b98a8ee38913df561767dff8cd9c4125d20a0bb29ec43. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USL360910180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5acd3690cf75585b5637e68c0bcc76f1a01af509353df997020c2f4b372bed4. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:01:22Z), 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/USL360910181.
Aunt Molly's Murray Farm / The Gramercy Park Sheik
Some People Play Guitar... Like A Lotta People Don't
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a06e5b81554dd5456c78c2e0162c822e5496d9b2c180cacd6575f537182f44. 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/USL360910333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4490c5a427c3d7b4aa1c6d65f388cfec61a5e2c1c245e8ab1fbf979176455f. 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/GBAJE0606561.
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