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 0xd7ddecb68541eed8b845ef227fd078cbf16411718c23531ac57aae2cf0fbf4c8. 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/eda73dc1-0ec5-4667-8967-11ba86ed4e2d.json and https://artists.proofprofile.net/proofs/artist/eda73dc1-0ec5-4667-8967-11ba86ed4e2d.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 0xa1c0b792cc1cc518d6ec82446fb240cc351e6b07e3558021c5538948ed6d7c91. 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/TR0861600380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bc8e356deb482dd0fa7811bdbd5b807904e732c62e75f3db36a6efb8787de0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TR0861600381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87036ee4ec597daec8746b9e7141165213cf4dbe6eadbbfa8e47eaf895630a95. 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/TR0861600384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ab4c4b8804ebf68ff0a577d978ae1f393422c7d5cecb9d8a1a2bd59fdd8d18. 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/TR0861600385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0eed6f087de0e81020d93c66842ae6deff479495e61cf1cabd7da15ec2a07b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TR0861600386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267ebe134c75120ef311c7f23cfc6e7640c3c7ca913dca89b519f7f82d478c0a. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/DEPI82105497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e4329f1bbb46fab87079e8bf9fa5ff72b6520cf39f661858ff3d84136f12863. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/DEPI82105558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1966edb6a9286c6257b22df4db0cac635de773f68248d62daf05d5b3311cf0f2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/DEPI82105560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aca62f5707514a44fcc3699254e1273ca338d83411d5b14a12d510d92e0ba01. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/DEPI82105561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4775ef41272839aa27462b4636b47c7df9b933150f334fa313936298c765c360. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/DEPI82105562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026d99190355d8c0d08082fd6c99a152f3250fc8f6aa17727323502efa7aca34. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/DEPI82106230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5721ce2d71f93f3798fa47dbecd761335d7b0163cc83ddfc5a54a502f463e026. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DEPI82113718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf268085c9eaacae8581cf5b3c9937589d46ee84effacffa1f48bb6ca9959b21. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DEPI82115222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27946aff6caa220e3aa95a354423c6d6f5e7bdad38442904a638c61bf6393d26. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEPI82203395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76799aea86236d6bfc9dfeeecfee20b6d9c8c5961fafc2fbcf55a9dda78f160a. 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/DEPI82405288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271e483c3066dfe9d1d6aa1b4fc04b94648334e0d2bc925b6a7010a32c24d12a. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/DEPI82519992.