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 0xdaefacafe982bf1d24743a714e8710e4d125518e20f04ddcf52fae601b8a0888. 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/d1feeba1-80ed-4e2b-a7be-fed7170db85e.json and https://artists.proofprofile.net/proofs/artist/d1feeba1-80ed-4e2b-a7be-fed7170db85e.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 0x1047ba7bd0d2182d3812e5a9d971f01d70b46b00269e8b95889810ea84ec4456. 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/CA5KR2450128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d16474aea425eaf72fc7c1ffa7dd78da0c34d1c772acd712ff010df193a5354. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/CA5KR2450129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b18987dd44f034c06355835bb42d9420499a596914a71a1599a3f7e34444c8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CA5KR2453574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45cbf41b9a4695737d6afa1cb00f9072795d16ba949033165e8c0f9b1af719b2. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/CA5KR2454101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce3c5c617da2b263466b86de081c6d09dbb4ddc1bed8d9377a409c93ab9fdc7e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CA5KR2454102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f404f34ad3c06a8a5263f0835e54468d33d7d8efade6ca7ebf88cae3387aef2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CA5KR2454099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419eb49a5b97ba402b6a2bf83c6e3dc0c9db267600e7ba64276aeb5a69c2b114. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/CA5KR2454100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d0a8770ee951ddef0efcde1637d46bc66d2a803748bbe6c37d87ebbb05c727. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CA5KR2454120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd884889f3a659a5b6c2aa5f8d68c3c4ec46377633d9a2d6d5d4eb06426be938. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/CA5KR2454104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4849e81e8815539da79ff99d7943552f0d70fe6963a004415715601175e1378a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/CA5KR2454105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2510d63823d49184029bcc160598564cfe8203bc13682c03eeeb76088156d921. 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/CA5KR2454118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bde06b2c41f2995acfae203df0b341afbcfe0200665c9c1f195abc56c51af9e. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/CA5KR2454119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94921f673c6de02d39a6beb49a7ebadc39c7fdc26fdf82a3371b5d96e9cee004. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CA5KR2454870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe40791f210e7c4ef3e4b7f81b7aeafd26062370ccec90ef21f958afd48f5b2. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/CA5KR2454871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3816c4f489883598e5cacd717383fa6d8c1388aea0e151c3fb3562e651c8e7f5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CA5KR2457191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8055df882656b22c6d0125168ca317f5bd5d1451fd403a65d84955157e6f99. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CA5KR2457197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a865d3503255c6274558287da95b515e9787d5ef449cb2d1adfc0cb303154e. 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/CA5KR2457195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e2fd5dfd43e6d5b5b3ae90eee2daa25beea713dbd7eeaca6cc1b4478685fad8. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CA5KR2457196.