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 0xb9417abeeadfa587917f6304b3510057174c7ed0c3e8d6416ff389890c864f6d. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35794a10-174a-45bb-8bf7-b643af17e89a.json and https://artists.proofprofile.net/proofs/artist/35794a10-174a-45bb-8bf7-b643af17e89a.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 0x89c1fdc56d707db9c8f21f55a3353057c9ba8dc7d9fc57b6b5263e1cde0f1ccd. 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/ES6101700960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d7fb3cb9e3da8b98f84dd1e602a2e869035dfbb7766eaceeae1a4ee60f0b398. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES6101700961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774f6215e0a3f9e19ec5228e17620d6583097843b50e7581caabc4b95b70973f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/ES6101700962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab9df4a801eb6819d334df8b45e460b4cf4fb9d0f576f9b8d0f3ad34f6f3374. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ES6101700964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec49687f83c650f884234a05ab6885b859b848d6867c7bb27d435d0fd88fa31. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ES6101700965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb530a6ec42d28624be76da4e985e9abb4de0c1710d96380c515bd4a03a790f05. 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/ES6101700966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0e3ddee283eb1a3cbc1148e5e64283eeb38d01109e7233f188abd6e92fb73a. 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/ES6101700967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7186831b7ba53b7b10e58f8416b77228b302ed794ebf3493f31906180f023379. 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/ES6101700968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33e348c99437540a5730c448c16c0d05526aa63734ea67063302ad17a27cfe0. 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/ESA031402201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc012c22325fbb3867ac57efca08e3ae5ed76eaca7ff289baa81687e041b7d095. 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/ESA031402202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec383280ecee3f801ea2f1ff577666ce1440db8a7ec913314b336b6ba9462a5b. 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/ESA031402203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b6dc02240371194e2dd2678d7767c8aa850b2fd373984077b42cf71c72f9d32. 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/ESA031402204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed1517b9a5cf1709051a102f07dcc116a139cb5fc794b9d72e8a9ccdc06d2422. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ESA031402205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x085ed3dd1282331e2a44658cdf84e59cf1b639548736c84bc565773a1829e6e3. 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/ESA031402206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7a9ec8678e56c3b24b8cde7f1edafcde3ec64338c663eb4712bc57a133fcfe1. 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/ESA031402208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd827dab261511c0460c30792a2dd2872c71fc558e0bfebe93c2f4fa892eece2f. 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/ESA031402212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8027bb5ea8b66a2f3aee5133a08cec0bb1659def6b85a68798ad030650a8a2a4. 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/ESA031402213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39bb5ab362b44ef0394c68f0fa821bd484086acba87c5c6f6ba29e2ad8227e3b. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/ESA031402102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca59d502fdcce0d5ff935a3ea7cbb1f4fdfedaf15afbd37ddd284cbc9d79b8c. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ESA031402107.