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 0x1027c8b9c2d82c3c2dcd734e3aab559a13efc73b7e2af3ca8599439483184f50. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6805e59-6aa0-41fc-883b-4b790187439f.json and https://artists.proofprofile.net/proofs/artist/a6805e59-6aa0-41fc-883b-4b790187439f.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 0x96469588f7ae78444b4a33cfc242184a902d50366d6479161cbc881f5273d194. 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/US3DF1966182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x907f8d32e43769afb20baeaa734c50ac0dfa2746de4387656f412613352fa74a. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/CZAV22000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37cd472d34787d3a13a3c49e18260fe4fb922ac243778e0df9e722bcc860eafb. 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/CZUM72301116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c31ff494bed8e878deda4366021de7f98b1befc8cc4c30decf778444e601628. 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/CZUM72301113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f39c2f97f8587cf7e7315776f1dffaf20bde65d9757a4f0f911a76e54a1817. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/CZUM72301114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9cf3b0f60bf3457ccab55e985091abe45116096efbf300042a84a63fefb8048. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CZUM72301121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aca5a3b3d1c00b3f3a5f7c73e8f44afbe4ff86c6ab852b881548dfb5c5fa88c. 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/CZUM72300815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c72431c4413159a739447ac16df304cb8b6985f9d60c9468c1290a526bdc775. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/CZUM72301115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3035a42b582818ea36af596891e40480aa5c0101155cafbe27e854af18280bda. 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/CZUM72301120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f0aaf7d94fd0c6b5f69731d9737985df84e60644840f230e382c15ed5527eb. 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/CZUM72401207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f1e0ad4f1b719786ed7d9b6630a4a74b5b3cde3cdee71ea4e8b50decc13bda. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/CZUM72400455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5418f625767503bca02ebc6191ab4880f2bfeb2dcb20a6a17676adb20b06b15. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CZUM72400130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ee8220e9599bbf4ea1c0a20edd3362b4d35caec2243c36f955180f0677f178. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CZUM72401208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f8abd5576cff766ac58610185823edf84bde07a8e0d70177cd0412acdfa975. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/CZUM72401211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0454151177d5cc6d35ccd2bed9793f64956121bb4ac33ea9599a011aad0a377d. 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/CZUM72401203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096236d5ce40aa6b0c831fae008a4ecbf96e50c106d506963927773c33e8a5b5. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/CZUM72401209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9068e1718b4005339708e5cccd07ecb4ba279b8d541a3c9b30389426858536be. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/CZUM72401204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563a0236bc7b9046f2e9e5510a8ffed9598f6972712437b0688920d46429c06c. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/CZUM72401212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead0f05c6a866587b85805fc0b757f6071f0890529d2254f5432057f07390555. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/CZUM72401205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9f9c1b1cb7c17ae0fedd94341b486acaf6a0566b4ce49d5c44c50b196b3f38. 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/CZUM72401210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa519928f1ad81be28f33ad84c50a38faf3583a1c994e6b179fdcbfd06de4ed15. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/CZUM72401206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59769166025c6b324b81a20e009ecbc2bed88418d67259e161a484491b026170. 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/QZN882185229.