Sam Gross (August 7, 1933 – May 6, 2023) was an American cartoonist, specializing in single-panel cartoons. He contributed to an array of publications, including The New Yorker. Biography Born in The
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 0xe4956c264c5183a1de61dc5c0c9c8d4fd2722cba255f5970efca7228096b36e7. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5d91930-ca61-46cd-9896-050f30d95ce1.json and https://artists.proofprofile.net/proofs/artist/d5d91930-ca61-46cd-9896-050f30d95ce1.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 0x4ccc55f599f6e469da34c9d254040da377d4c6ebefa3c0f41734a05dac3ef8f8. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/BK4DA2510254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a32b48f92ca9882b0abc940f6a5a89f2249c67c7c113b4681e85c7b99fb679. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/BK4DA2511801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5674f9600c7548f5a44161b35eee2392555bda5c06bc18b85c0f65a086e9406. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZDA42542097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a32b48f92ca9882b0abc940f6a5a89f2249c67c7c113b4681e85c7b99fb679. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:57:57Z), 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/BK4DA2511801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccc55f599f6e469da34c9d254040da377d4c6ebefa3c0f41734a05dac3ef8f8. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:47:11Z), 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/BK4DA2510254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a091cc8288d5738244be1782a93a2cba491d0fc259e1ae7f8d018fa4519ee3. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T16:03:44Z), 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/BK4DA2531610.