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 0xc151cd4a94813671a9f581e0317f24accb50aacfe2fe6d30745a97e218cb2b6a. 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/4fb07125-3070-4ed9-b342-083124341dc5.json and https://artists.proofprofile.net/proofs/artist/4fb07125-3070-4ed9-b342-083124341dc5.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 0xe84c1f19f81bc67a7bd4bf46fd8f6f0e7100649cf2684fa27798f5e29331823c. 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/ESA011844611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9976d36d945bb0ca016d822b1f348487f6f9e291864ad39dfe37925dd47466de. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ESA011844612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e9c8046749779720b8e78357c404ef6fbe25eaaaf717fb7a484ffde22b2983. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/ESA011844615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f7a97d3a20f3e3ada4e89713f5a99f1f26455f558e2be1149718dd2c536d9f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/COATT1902136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a71009aacc56b131a53b5b5bbd768d1322e0a69c1f1bcecf81bcc7a74290308. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/COATT1902126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ad471369eebadc1763ac71eb2c69c26a39d316b9a2401cac40be212e7da1e99. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/COATT1900389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38cf638c5e7c99af9e339768da921b69dedf083b32d882b063d5df2626033f70. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/COATT1902093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe449c5b61f0137300b8f2c395ec5ea0211114b079de8ed793df848c37b4c2b35. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/COATT1902113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7399a1dbfef4652cfb65a2de3ea253385b6e9af1033cc1e65769f2e3b593826. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ESA011844610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9516c521e4325cbf67d7dfe76c4a37a8472e8e90eda8fb8a71a217eb2f507bb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/ESA011844614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1738435ec57078f3e2f76e65541f8e84c4c295370d3f33a413bcd6470c3f71. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/ESA011844624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bb13976b9e2953ce8417a0c7b307628f071a53fa423eea86368fea4bdb8266. 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/ESA011846679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56c0d0c2137554fe4a78ed98d303a36374a4be9a87762c48a47a1f2a850b4ff. 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/ESA012038307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x456c676c984f3427a00004ffc1e1bcc5d4dca2fc221ac8b420db280f02630775. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/ESA012038308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa35a4d5bfda7ca6b0231b376daee9889f3f5face9bc688afdc05c2766d7491b5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ESA012038313.