Robert Mac (born Robert Matthew Matz on January 26, 1968) is an American comedian. Life and career Robert Mac was born in Detroit, Michigan in 1968, but moved with his family to Tucson, Arizona in 19
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 0xf0bf9bd0790246d92fd09a7d076c3279d1d167517c2afb8204fcb803edba0235. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3424bb4-4466-4641-86b0-b8253f55f0b4.json and https://artists.proofprofile.net/proofs/artist/e3424bb4-4466-4641-86b0-b8253f55f0b4.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 0x34c82e50cf718a437684b7d9065bd03d77a3a3dd2c474fce390ee0b210a4321c. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/USHM20838113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0fc0f7a466da24f4e014041aab7347e1e091fe2d58160e5acb5fe8ce96f65b. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/USHM20838114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53071fa774b8ffc81cae646a861f238f9f98b6056b24dc953ce6ef0371a41db6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USHM20838117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829e15f480c8dd587521eba997035b21e19686a7f002b03418b3d0fcf86bc588. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USHM20838121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0bbb07af78a1023b33fbefcf0d1eb819fdee12252ab406706a678eaef75f65. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:04:34Z), 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/USHM20838123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff2a88c7db10a2b4bcde6d1bad9ca8d17dd8f447a5d0f11f3c6892c3622f673f. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/USHM20838129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5fd760f8730596b34d4185f08d422c6cc7be119ace992d7aeca187a1858ef3. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T11:36:12Z), 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/QMEU31925348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfeae20b4fb7cfc1c7f3b9938d8da262c27f2e0100ba536eebcfe2d7c461957. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QMEU31925350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa979668ffdc9349f283272afe6464f59ccf0108743f88cf3289d014a1d98c4f1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMEU31925352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2d648663baa9dbc7af044e95ffafd92c7d55ef2f580e178d2f0ff4b2b2fdd1. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QMEU31925353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e57e2a1f393412d6fb78cb83ee1b2d143181e7f782029b00181ce66e09665d7. 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/QMEU31925355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07bdad4c990014fbb3bb684968c0941ebdb4e9606a6e7bbd5193764875c87824. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QMEU31925357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x883b3dca10009b6db82c496e9a1f182993e4079dfc6bf8b073ef7606ce0a37b8. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QMEU31925359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af60d307510323c6c5980a1193f8fa127a3589be8adffe87bc67b2e9463f192. 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/QMEU31925360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb3093be1b3cc00003c329c1ef69f01582349a4d22c71801787e1cd22d1d0d0. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QMEU31925362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c55226bc5e576aac14e8489093be199a9c6fa34e5dd73d47f1f015bfc715aa4. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QMEU31925364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb622603a4fe204388a31b03c9276a68f68392a44d82b6ce5d6b35ba4366836dc. 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/QMEU31925366.