Bill MacKay is an American composer, guitarist and singer based in Chicago. He grew up in Pittsburgh, PA where he studied with guitarists Joe Negri and Eric Susoeff and in Rochester, NY where he studi
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 0xb9ec8d837ea34e4f6229c774e317d8d419d7a2c56bd0360442a78ad44f4588c8. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef8a65b4-876f-468a-8b47-ba9cd6215198.json and https://artists.proofprofile.net/proofs/artist/ef8a65b4-876f-468a-8b47-ba9cd6215198.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 0xfe0dca58b9f99024110f4ee6eef310b356ff601674f17ba3c84812bf629050b6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US58L2080301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f9d1b68252aef1f30379f005b776f422273e0c54d4f3c5cc910a153e39af92. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US58L2080302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f418bb293c8bb28e05023de9463c289ae9373bf30a733be03cac52b0e48704. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US58L2080304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0ceabc3aee41bdc36213d4a17c20a90b557357f2d536816bcd74db65cec028. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US58L2080317.
Pedro Y El Lobo Presenta (Live Benefit Compilation)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7e319e1fd1e3ed0a959f518176c4dc96f7888615a07165356e6bad7967fcbf. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US58L2178401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456fd2debb345d013cbea4166fb6e9c7f394cbd74ec9cb86df804478e19f51b6. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US58L2178402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13a0ee9ca063f93b1a31a9465ff174d1e1b2a92f65144456ebf82c5087c3bb10. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US58L2178404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a18a32aaee3d747de55ad6ff4ab3c08bd869a544852e79af2dce48651f5f81. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US58L2178405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2f012708129b3c4a5fc85f97b4ba0201253c1041823170ca3ef38dbd909d98. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US58L1768801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadef60a759977b928b8638197fcb0ce563952efb4aebd13c0269293080dedaf8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US58L1768802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6153953171cbf6239b3c424935ae0e08c9a5be44832a38db3d700367e26bf06f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US58L1768803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb568e09b5a406f4488c38bd1383e8a1bb0c727969d369e880384e24fca1ba659. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US58L1768805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff0d7e78cc89138edd90f59f98be0dfbdd636338bc0412810ead4bfcfe06fe3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/US58L1768806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5afbea06881d902648f084c8af1c8b4fddd2d3f739356a6735b0182fc8423c6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US58L1768807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923bbc0fea2988c0f2e3ddf15caef84817c7df7572b84d038fd616ce7335c8a2. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US58L1768808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3b53c3a70cd47d43af3cf7d815875641ec978a78505ef2337e10de2c4afa88. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US58L1767601.
Sunrise : Bill MacKay Plays the Songs of John Hulburt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a18a32aaee3d747de55ad6ff4ab3c08bd869a544852e79af2dce48651f5f81. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/US58L2178405.