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 0xa4b979d732bbd0d00ea55d9d2cc666b3e2b3ebc9e10db8da62d074def8b3a591. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b015cda0-f7e3-452c-8bec-1b5b74166f05.json and https://artists.proofprofile.net/proofs/artist/b015cda0-f7e3-452c-8bec-1b5b74166f05.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 0x34c48ead3e787a9b25c31cf50e18b63cf8a54b8af1d2f0bc56dac9f216db3b13. 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/DEZC62166915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4b0264abeb984dd4d41977883c07411cd69416f41f108f5bb378ec3d45ea9b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZFYZ2134112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6ddb790d9bef7a7b222f5c8fb335ad203a71188aca7fae0262cc9a5d85b4f3. 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/QZ4JJ1989059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f08eca69c4c05e81cb719c99d636f4e5165ad80291e429653e2d099b470fd8f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZ4JJ1989061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171fc18e17e19a8b214670771a15f6082c871253ca6151f60c1180840bab9b7e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZ4JJ1989066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd19c41318cec61780b159b25fd72d1b40271fb474efd7203ca1e93c2efdbc773. 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/QZ4JJ1989072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037e65481aacaa926759b0f8187f8360e1c837dc0f0069d004c702d711c1964d. 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/DEYW82414280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d36ec48a08ab8014d819e8ec2491b678ae64d0e724056a91fa03525b2f1044. 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/QZNWZ2422113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb35995cc60c225687b0d42ce428fcb1357a5576cfa21d540629fbe4f7ac15a. 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/DEQZ32000664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d392f68db7456cf99a4083eaf389966bde23213fd08a6d5a2a0f48d3f14311d. 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/DENL81609044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c144da209edcc3dca4bf0a84d5e3436962f1d0541afcfb5c4350ffc8f1b1d79. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/DENL81609053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab66e0bd4c9ecb785ec507f7dfe690402d049f6031fd57fd048968ba1012d0b. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DENL81609058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8fa85d104c89892a7e2cc0f15fd7d0c8a9c3fc55eeced203e7a90c206ff37e. 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/QZK6Q2110970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346a3f414308c4645d390e7f160377f9080601bb9b837038e651af14f2a5ea87. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEZC62406500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb595f4ea64bdf80c42e8b091c8dfa6bf6af6afee67ceba635558539aa5ecb8b0. 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/QZHN32282135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a2e908f06457846fcff99613acd028e164ee34f664c0c8e3099901d3235980. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNWW2223189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43bc8b8158d8bc7c564dd462cc6efcdcf8858153672303aa00968786b14e1542. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QZK6P2269150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26fe1d84e0012cd17f29d2bee7b3254f2ffd5714c6ae5e42dccc1095ddc662f. 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/QZPLR2250675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ae3eb3cb0a035ac9a92fb98fbca60d5c069346906f6698921c3280508ce413. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QZNWU2278699.