thumb|350px|Part of the Zliten mosaic from Libya (Leptis Magna), about 2nd century AD. It shows (left to right) a thraex fighting a murmillo, a hoplomachus standing with another murmillo (who is signa
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 0xa9f504d839c88b4f395a4224cef00cffc90c5104f43afa42937f22b32cec7863. 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/7f34fb83-a624-44ae-97a3-bb3d1918be3c.json and https://artists.proofprofile.net/proofs/artist/7f34fb83-a624-44ae-97a3-bb3d1918be3c.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 0xbb6d37c495fc4e607355d3ad3d70b631e002ff525b8c17f7416d78ee8a925ce9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CZA210300169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6380fd8852c5dc5f2919b90cba522080c457747ecfbb19792f6f5a38d2be003. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/CZA210200527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa518f7b42e6a17e918635dba33a0fa3e3c4e1d6f4e2f00844d0a60a20b26f5a1. 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/CZA210000410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3227f75fb0e6f71d25c96685667da116ab34ddbbb84efc0a3842bc8590a7f7fa. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/CZA210000412.
Now That We Are Free (feat. Izzy) - Radio Edit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54135e6145708d338490c4d73e851ee0ef38c64f91c87a6b4f2b7981b754e890. 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/GBENW0300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a769769f78aaa90d2c963b264efb3fde8f719dcefebe878f299e6395f7a1ff4. 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/SKA010400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48bfda9bbbff883d04099ff7025e7367e88ffe55350a64504542b6dd31eb6cd3. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/SKA010400098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21af262e625fdac704a341299f11c9c1cf66f3671e1e374053f2b2dba99d01e4. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/CZA210801196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa506d326fcacd31ecb625155ff74aa60d208089aafe3de9c4cc6836be64ada2. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/SKI021701402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4ffbeb62c5d27595c4cec0e2cdd9db93decb90c1e908feb310e1c6506a29cb. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/SKA010400086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae13d297d537263b10e3ad7608bd1e697466fbe177ad5b914065c924eb47d3f8. 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/SKI021601401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19681476ed701e56acb0aacc264f48e429f57fb2d6037da331e8ad9dd985f563. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/SKA010400088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81f135cf994be76f3f220035f125f4bb80d2de34453930ce46550da3849e810. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SKI021801503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac55faadd98cacf7e7dde0e0307a13e6d0454fd6c32d011afbb43ead6439fa18. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/SKI021801509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2286888a2d8be05cf172986b401fe29f1657415e1f5c82289fc8003b392d6c38. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/SKA012200059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3227f75fb0e6f71d25c96685667da116ab34ddbbb84efc0a3842bc8590a7f7fa. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CZA210000412.