Bio-Cancer is a Greek thrash metal band from Athens, formed in late 2010. History Among their earliest releases was a contribution to the compilation album Thrash Or Be Thrashed Vol.2. They release
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 0x81336bda790bca3b1624c942ef36f5e7b2e181494922d52282906e70d2c3fb51. 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/e5653e2f-7702-4f3b-85a4-2fd5d5530742.json and https://artists.proofprofile.net/proofs/artist/e5653e2f-7702-4f3b-85a4-2fd5d5530742.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 0x394610964c2d4a17c84d58646cc9c0bec00bb9e8b222feb94592e4143963d973. 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/NLWJ22300314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918193c749182e477d16a52743e428e547ab8e705d189f104b06942a6fdb459e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLWJ22300315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c7c2f2e3c6d1e1c14b794695ef7aafdfff5996cf7a8fb60ec16a32db2bac1a. 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/NLWJ22300316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc63a18b7626ef096304c7fbfcba7f17cd6df20efab8d6c5a1f18f70fd62c11. 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/NLWJ22300317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd725fee60d44d8a82c239a53893dcc93e3156042e870bec3ce1b5732c81f1746. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLWJ22300318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1594241dc81884ebb94eb51f786d616350c2a88e61aceb40f412aba3c17a0956. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBADD1547901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56c7a63e48cbc819452bebaa0ba32e15fe6bac018b5680a2305a59fb701936e. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBADD1547902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfb8b878302178604f2a178041e271c35ab3a226f022e88ddae7e40792bec35. 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/GBADD1547903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c5006ddfc1294ca8b005d7e47041b625b443bdd13923535aa750634a3c3eb34. 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/GBADD1547905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a5d6d0300f06cf7e5907fb18594173442ac072f680566d96202ce0156808a7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBADD1547907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b8c110a16ee689b6d39a83844a036e8fbbc88dd39c65fb1f5f07a9cd41dc2f. 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/QZFYY2137085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa206441829abb5b23088d5087b7e48eabec4af565a722bf8cdd5dffe6da74e8. 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/QZFYY2137088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9122f5100ce6bc7ff84318ea68aaeab2295aac3c3b5c26f389b48e30a823f3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFYY2137092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba500021fd671b41afc95d1aded1ef50c6675033988aa5fe2dee4c2df5a8e72a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYY2137093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a3187c084dea9fdaeead35b83b750061527d059720b77904f7a9a50bc349ae. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZFYY2137095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918193c749182e477d16a52743e428e547ab8e705d189f104b06942a6fdb459e. 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/NLWJ22300315.