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 0x4efb4f6bf118463627efd0bbe8b947d0a29b55cf328f70b675062a33c96a05ad. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a328776e-6b58-4580-8bcd-ded81d1e1f50.json and https://artists.proofprofile.net/proofs/artist/a328776e-6b58-4580-8bcd-ded81d1e1f50.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 0x6817b75856e3616f61d4ef2a5b4744e4ac5dc27575528994edc075e3c63c9f71. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FR2X41637610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ffe31533b528e6774634f020445bbfcece0efa733855738042b32b1d847cae. 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/FR2X41637611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccff0df938dc8b19d993e65b0fde8075ff9c6c4b84847ae59fa613b42b322b6. 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/FR2X41637612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846edab39afa4c310ee468160b8a0e88cd5cad6b49f9ca98f5f656e240b7715e. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FR2X41637613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e4c4c32915f22fdb51183991cd4751e23e3671fc7a778cc2bafa407a70f217. 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/FR2X41637614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b398d66ab66653a17106a752c5517407978abe8473f6b8115db0ccf22eb39d. 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/FR2X41637615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90deb98d200553ccbe0c8c59d7476dc69fc5a0b42cf5b1daedbf3fb410caefe1. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/FR2X41637616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc366f73f92155cdbf51322e0c7ed8558b3f181c1aca89afb7c617516b3477ff9. 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/FR2X41637617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa19889a8d426de4239313c005a3e5ba89c67a15895ba6fdeb7847b66ae1bba3c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FR2X41637618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa086ba8ff73caeae87cfc4fcb1925545b3e0234a771c912129a9cd26fbfe40f1. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/FR2X41637619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378ade7ab2015b08634170fa210fc24db603f52c231ecf638a27093b239b6036. 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/FR2X41637620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fd37147b6ba2d65488284c0f5849e67c185506979468dbe197035689bfd71a. 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/FR2X41637621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c96c65c036928b4e7dd335f52eb8c7d1c938c184772e034030770c83b2a3ffe. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR2X41637622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4a7b0498671add87b3767e63167a3e61dcb7f3d8fd9d7d55a6558c8a539ae9. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GB8KE1552040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd131f5904a852622d34696d0fb004b751bfa8a5d011b3a6281632c6abb0f1eb6. 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/GB8KE1552050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f60de8ae23003cc32f087f9c919fec9e9d3b3985102ea025fa34e16b8d11b3. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GB37X1200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdc57d3a0297dce2e213948ee71aa0dcc7bb2d6cffb6e083f0474b89aec93eb2. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GP37X1100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9854e3a74e2ecc47d666dea0c758f442f23ea6f5f34c95d974009739bb9d4e01. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GP37X1100003.