William Blue (c. 1767 – 7 May 1834) was an Australian convict who, after completing his sentence, became a boatman providing one of the first services to take people across Sydney Harbour. He was also
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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ecfb7cb042fe691a331322378012aa0de9c1f7778aafef468e6c6ea3407d3bc. 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/ef24b4f4-2155-4279-9387-4ba8b932b034.json and https://artists.proofprofile.net/proofs/artist/ef24b4f4-2155-4279-9387-4ba8b932b034.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 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38dd715cca12b9335f91d3ca45262d267dd7dcfd1859570c9ade120bbb9ab27b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZ85M1928864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6051c75892080a9fcab574cc060c32276600ab482f732e542d9f808d3af0fa. 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/QZ85M1928869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea2267d84da8fc0f5458ee74f0fb686177a0e0ee5611fb009c0b946555329f3. 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/USUYG1032501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e916894858cf57584e7d64f41d6de9cd968c74df4f6fdb1ce7a89cf92cb53b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USUYG1138296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0ef23ba6f974a33e1e83ecdcc55af9e1bf839a851bb5e926d482b5b0f62066. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USUYG1138227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3d766cad6b42619fc44132bd15dad13336db764925cf1ef0df99593e32070c. 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/USUYG1138230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175954024ad54a8e0d605fe86a08057ea02ffc8c73cbffaac06cdde20039dac6. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USUYG1138231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x814a37877eaa466f41600a43514d93df2d85c9653c053c2057703d9bf9bdfb4e. 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/USUYG1138232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9710d6d86f2c6dd3304d59ac8c809d80242065f6b4ea2447e33a34e7e830bb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USUYG1138234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd245bb7d214f4746b26d1e8a4dcdceac526a03a2b2cd6e46edb0de133e77cfbd. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/USUYG1138235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19db157dcf22acd6fd6e1a3140bcca6462525cac311e2a305de790ee245fc8d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USUYG1138289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b09c2bf63d7c07bde0e02710ae313724f73b5a3232df19b03f6d79c65896eb9. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/USUYG1189993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe1e0e84707b09a8f2ca1d12fa055f6a2d32b6beb133f853f127cbbcf769649. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USUYG1307725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db4e1b9b25a67df85ed919aa4dbdbda5d2c52b3867608590db9b17a854d7188. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZMWW2483336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a8a9ea56568e065b2025dc398760e412782ee5972e33194fd5f226ed622ec8. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/US5KD2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59705b2d2624a13c5dc01b42f4b86f5975b0e87e44e656622970f21f8561e0ba. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/US5KD2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a8a9ea56568e065b2025dc398760e412782ee5972e33194fd5f226ed622ec8. 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/US5KD2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb43f19364ec0061efffd623bf1b07456f18edee29192101829ebc20943fa639. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/US5KD2500013.
Chopper (feat. Billy Blue, Buk of Psychodrama, Trouble, Trae Tha Truth, Fam Lay & Glasses Malone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dab91ae4470c48285daac7df212f870579e0e54e93db3e8f9240b2e3fc3dc3. 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/USAT21405279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb759fb432ba9986135e22470d098c1fd7eccf70ece703746d4849c7ae6eea9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USAT21404376.