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 0x336f1f090c258d5a0240f4d15727601ad5b36a59a895999761731a60acf69e12. 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/54172e3f-12e6-40ec-93ed-bced15d36975.json and https://artists.proofprofile.net/proofs/artist/54172e3f-12e6-40ec-93ed-bced15d36975.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 0x649491caaed6df44abe9351222e7efb1a2e4549a9e926205fbd77f576934cbe5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZES82371974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a64696fc84e59140944676e486077070ba1515b9f102752431a945243ec4a41. 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/QZES92331351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b340e1d0500af5c1155bcf0dc2354b277eadb56733edb5581f7d98eddbae98e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZK6M2341810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a6f5ae868f64356cbeb3283a7c242da59aea441db171efc09b891e37296f63. 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/QZMEQ2391580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cd8d36b0f18231640d70628d032f42657419a192750f4025092c4754377e03. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZTBF2339454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c63118a34f515ca7c7aa9e54ca2cb2e81b09a10091501e59ff05a95c1c67a6. 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/QZTBF2389598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaeecbe87fa561c4d787e55cc56f85b83a41caf7baf60306c3042929f6184ffc. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZTBF2389599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a120526bdb68ecaa436432c4eaf7b0fb37913670fe7674ba1732a6a935d353. 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/QZFZ62447725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e20b670bff466a188794e2d6378d9201fc7227c227997dcfb531e059396d8c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZES92443319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b39ddac4e251f13dfdb47084c39dbeb35344a426051b7a35abf1d01789f974c. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZES92443320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf47a23a8c5905678e9fa396b744d16ef7bce79e8d9abe748257e405183fa7596. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZZ662468407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31692ba17d5ae8fc43c3174e6508bdc73592680979f74fff529182b8e307c924. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZYFZ2410808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7feaded784927ade22fd7ef5fb980a6866738f4de0ce5ef579e5fe43d960a19. 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/QZK6L2449606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975ab35f24983d4c71f43371f5e9989f717ec459c91e7ee56ec43444b2e35fb2. 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/QZK6L2449607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57706bccfb87915043dcf9512d09d0094ac3a58af53c8a3db6842b264ae94c30. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T14:43:57Z), 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/QZPEW2497979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c34e94629e4b675dab287e375b6a6f03de22c34e8d5cedef70692e2e7bdbf70. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T23:37:44Z), 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/QZPEW2479953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d02ef093fc2da0feaebdcba0a11cecb3a194e8acf4e518f136bd404dc879640. 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/QZPEW2479954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27f3a65f60d94d55fc04eef7c8e76cff20d1d454bc82c2638ce16668f12fa266. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT2VB2403705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cba24607c470d782ae61669cdcdf00e0f731dde279c0e737101f8d7f6418be5. 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/QT2VB2403706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x096dffb3c9fa0e33c324dbe84867d1be76d1c2af54aa4c6a2041e36bf646ea64. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QT2VB2412013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf070bd7d606bf9a7845c9a8a7babee1539e56d4464eb29dc19be035249a8e644. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/QT2VB2412014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cf98054d8f8cc17f95a4113f5a236240fd65ea46d2f9678b4be59155986b4f. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/UKZGC2506039.