Matt Holubowski is a Canadian singer-songwriter from Hudson, Quebec.Ben Rayner, "Singer Matt Holubowski, a big hit in Quebec, takes another crack at Toronto". Toronto Star, 21 February 2018. A fluentl
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 0xae77466d127c37ed6776fb404c7dcacfadc3227d0ddaf1bb6bdd60249dd62102. 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/2ea70ae8-816c-49d2-8548-c512ce783f81.json and https://artists.proofprofile.net/proofs/artist/2ea70ae8-816c-49d2-8548-c512ce783f81.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 0xd0d68b7d18b5bf0bd53eeb77cfedeb909a6248e52586d3cdfef821685c738882. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T12:09:13Z), 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/CAP6J1400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0c3cc51349ee0726b4562aebd4034ec49e05cf4dba5059052ac8dfa225e763. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CAP6J1400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531559ba654bae67c4054623a41d79243d5ad5b9f72fb14467ef8f36085f6af2. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CAP6J1400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf26002d85f09d86917d9236b37e06ca7a12c0664497def08632e5e0075e7480d. 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/CAP6J1400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999acf988e35fb2af55fd0cd44ef4343451057c0a92111dbd604d1c30034160c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-19T23:53:47Z), 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/CAP6J1400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99abe99c119cf042e19ffa4fa71e56cc73fcef569a07d09566250926ea244ca2. 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/CAP6J1400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bf324896ce8a1f213695cee399ff15c47620362a95c2c5c97fd8f015548f7b. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CAP6J1400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab97a6c7a0a5a2b071731b2dfb70727211ab65bfacaebc85a05440b2465f67d6. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/CAP6J1400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecdb123268326f189e1cc554308d3e1dd493fe33fc0a2cee4915b7a83147bdde. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/CAA501638207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5d41b0a1de1d884ff96455508ca80129501d586bac378adfc59c6cc82bd29b. 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/CAA501638211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d78cb8f608c299574a0b13bba4c1f4c4754e09bea158ed51cd9891ec4167b95. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/CAA501638201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd882d7bf59a1b5afaddb4eb37e9ff4cd92abacd0e3d78026639020ce12e84e7d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CAA501638205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ba5e03144aa44955712ab7afdaa5428dbd83462944433eab2a9ff9fb094e6a7. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/CAA501638206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x949295f56656625fdca4855da0c5233142280d215666c32567abcc7f6f0a3e2f. 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/CAA501638208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c38552f0760dd43d22c26d713957c15bc135024a72b2e51d138ecbc60dec402. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/CAA501638210.
The Weatherman (or, The Felonies Are Magnets on My Coat)
The Weatherman (or, The Felonies are Magnets on My Coat)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e2704f5ae0c005c3e5266638725f1f1e43523d78b68827cd15901cd77ea91d. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/CAA501740501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b59fa99d45dc669dfe9f24b32b0d4efd8e39519f3bcb75661640ef2ce8e5fa. 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/CAA501740503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5d41b0a1de1d884ff96455508ca80129501d586bac378adfc59c6cc82bd29b. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/CAA501638211.
Matt Holubowski: The Wild Honey Pie Buzzsession
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36a659e2137d2964b258267cb89eaa57fdc23da297007dd43ed9a5ec61d1585. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/CAA501943504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aba5c8c9bfedb28350270a8965308f4d6970e3dafa2aa12c1f2df4c09593be1. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/CAA501943501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefff61ab24678069fccd5984a680f7c5c458fd9f949e0933dbc8cf79080a9fca. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CAA501943507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x780b2a3f825a2bc756f6580ad95678349be3f674405594361a1531c0b316a1b7. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CAA501943508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a9e6b4400dd0f0e0e975b8518a9bad1a9c9d3c96d08fdefcd4bfdc4cf61fc8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAA501943505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a23d0b05017fa33846469b2254cfc21acf71922b81851fd862b52549093896. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/CAA501943511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b1a36fc98df4047dafb6232eba1e121cf661ae827e2e0f0bb0d95ae4f30bbfe. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/CAA501943513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3db0df8664493ff91cb7b3833fbcccaacc1e5d51b6b908544504629928ede23. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/CAA501943514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccdf372f8a1322f33ed77413fde47c6bc006b09943c0a19c826536a9321ef21. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/CAA501943503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb585d190b0af4dbad1fe923c11188c48c96012d9dfc71f4453ed893abeb25b. 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/CAA502348302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417584227c284d1d0990b206c8e60ee600f3915cb6165ec7411a1141995b0c91. 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/CAA502348303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b334a2bf466c4366781fe4eed3fd639c7021c10d387d1cf0e70718ed3c4713e. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/CAA502348304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9444e9ea10566b500c1b0a3f7b8a87ab168a238d050ee24d70b3889ca0e04b8. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/CAA502348305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cfb7ea6bf3b9fdcc8f2a56a20498d5d5f0b4fbd1bcaf3fb31188af1e0724c0f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T22:15:44Z), 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/CAA502348306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77735b97deada9a9c7d6e4356dcd6ba4bdf9f754448a0ba7a738b65de74b0994. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/CAA502452001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206fe1a701465a9e8475c18c7b0e74da27a2aa998277cb45a3938fa370323f44. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CBAHX2100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x206fe1a701465a9e8475c18c7b0e74da27a2aa998277cb45a3938fa370323f44. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CBAHX2100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80a5fec93dcd3744b9f5ef581e83df1d084d0104c4240e49a85520d707822cf2. 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/CAA501841001.