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 0x37fb778f33dbf63d5641282c2a079f7b13066ec38436664fdc13520873e46ee0. 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/7e22036e-784e-4f5e-8af5-1e254bfa6fc9.json and https://artists.proofprofile.net/proofs/artist/7e22036e-784e-4f5e-8af5-1e254bfa6fc9.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 0xe8b76cf569f461ed16a850620b24e8b3f27f92ddc92256f6e44c187d71a18737. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZK6F2425963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f71f7a1576e174dcef7fdb8d340774c5a27d340b07ce735eede2916c105dcd8. 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/QZNWT2097734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5746097995aae0ae53e06523346993bee1a1fae4aa0bc8f1e76ddb1d98b2065. 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/QZHN82118643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042deb11c9d7e4f475eb0d02bd402de8faee37dac94e7af8219b0e47c3d19df2. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZES61900348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5da930c56a76310f3259f41fc19333dcdad5e618cd9d4467fed4d7739c081632. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZES62374010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b5a928bbbecb230184010c222cf56ddb83583574a333ada0a7cc3ae1287f10f. 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/QZHNC2249321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5746097995aae0ae53e06523346993bee1a1fae4aa0bc8f1e76ddb1d98b2065. 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/QZHN82118643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f71f7a1576e174dcef7fdb8d340774c5a27d340b07ce735eede2916c105dcd8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWT2097734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fb2acc1ca5c9b915d67a4f57108f7f29c743205ff34c1db034efc5a095ea0d. 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/QZK6N2011631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1ad077aaaf19256e8259387dd41d507f8ca05fee5d2f780e2706ba2c346e35. 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/QZTAT2504797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26067010eac1199b5a3024650b5000ad16915d3fa644bcae15799d1b4f1432d6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T16:23:42Z), 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/QZMER2513025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e866312ec27dd8169f1acb38acaf1ccf9e64d0ac133aee4a400ed5147ae8c45. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDA62555361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e40d958c712f867756b68a68b27b3a03c9ae7025c7ca6de86ccff48eeb0fb4c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ62586937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb6ffe9f1a09b6c1b24442b265d3f6072df7c71e8902100f1321309134ad5283. 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/QZZ7U2433592.