The Gutter Twins was a musical collaboration between rock musicians Greg Dulli and Mark Lanegan. Dulli and Lanegan had regularly contributed to each other's projects since 2000, most notably in Dulli'
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 0x4a2c30b6c53e676f5093471c25232bc645cd1b33c362a5c7b04ea35e37439ab8. 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/da6e7f7f-d4f3-44b9-a6dd-8538cccaa3af.json and https://artists.proofprofile.net/proofs/artist/da6e7f7f-d4f3-44b9-a6dd-8538cccaa3af.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 0x4ec6662dee170224c66dcc5cc0318c110fae37fc97e2f932fb6c800334a62dcf. 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/USSUB0879401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa00bc6eb7916b71c36e52e784714ffa9628a197a6212f7df220e0c0cc5d4cfd. 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/USSUB0879402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d32b1389950770ad0cd85744809dc9e20bbc31de2dcb8f46e743bf016b1f99e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSUB0879403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f89de9550841b10103f14c26169dc423ad91c66169136618d40753eb8dcd6d1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSUB0879404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cad47362740686a0c11a6740d93b5df7593079d84f788dad0191c24aea16fa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSUB0879405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4716d2318c6f9c7fb96033cf03c40165d20a824221e65d5e073e521c49a7bd90. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USSUB0879406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e69f8120d976508b2f02e19aa58ce29430c57c0c6f7378326b8e8174a61b1c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSUB0879407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccf88b959a75b1c81ba5eaf878457bec0a3c7c4e0a8a1b961a3e57698c8acdb7. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USSUB0879408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147a3375b9e1068ba4321b3a90baacff0ff9fe3d6c885e366ffd942415bb4d94. 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/USSUB0776101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535322112d60b54fb3b3500fc516c50cea4ee833bbdb87f330596393a0bf2ff9. 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/USSUB0776102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c49546ee1c312926be42345033d522e66bc9a222c192c2d1bd2c5ab2fc0811c. 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/USSUB0776103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76f21ef2ce4e97ce0fc69dec9c8dee672d53c96c8cd5120dcbae0da5a616a633. 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/USSUB0776104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c32dbf0ded0ba97b5fe7793e57d1c82d19eac20aee1c59ced244cc341bbd309. 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/USSUB0776105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da386af211cdd338772f40cf27ae4df94fd3a65f0c04d54c50bf11587f891f9. 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/USSUB0776106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae80f07e2a5f3ba6c9d5234ff95f85d2f69cae02488b468f89b1450927a02fc. 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/USSUB0776107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dabb820eda44787885d0804a579c49480b798d267fd664b4c2e21aef9abe6c8. 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/USSUB0776108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172fae22dd00e35fa5972b9d4120274e2f46ef60a38e838417bfac91dc3ba6eb. 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/USSUB0776109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b12c8025b1a1278e582e27341845c6a2e9f0c469bc7a3391597e3d6f0a3e02a. 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/USSUB0776110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2beb657582c7182aa6ef5cf30c96547508cd2b6a42c60796c8bfdbcbc704855a. 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/USSUB0776111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09b2b308cb92a385eabc07dfb49374249eb03bb2cd61dee87f51662f9536ca8. 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/USSUB0776112.