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 0x8f85e452e10a8813c3251e273ab711a6316f46953dcea6fc8cac3ee3c76399f2. 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/e48f3e46-d968-43a3-b72c-3e84bcf02f5a.json and https://artists.proofprofile.net/proofs/artist/e48f3e46-d968-43a3-b72c-3e84bcf02f5a.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 0xa725ae978c04801ce8e58e0763e530550d7b09c187efd5dd54e10b59cdbf58e3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812539365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10d09003710928e5fc65986f678594cc29747aeac9df721a9e2566999dc5a752. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812414016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0275d10ceb5c43ebc467afaac8026b8120098a70c8ff07ad166d9e36b1370362. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CH7812414018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6757fc06e082f5e57386e6fa5046440cced6d6f50ed1896239e0fdd2eac44e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CH7812414022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9463d6ce5f31619f49248d514acc7b9eac720c8640e00fb25342598fd895aed5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZTB92341667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17cefa6f3a4e4b9d6ae4ee3176e168ee9b7e1571ff43cf6af771ca764e4ceb1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812532034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29084e1590d3cdce2b288fc30f5502021fbae2aa6841fe329fe0b1ed805ad2b7. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812532035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b567a596a60eca7bb07fe18185e647747e1a7c3629b26767b97805fd702841. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812532039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c0f6d1ddf15dbcabbfada9f65c018f0a6c711d30345dd052b24e8443ac9e34e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812532040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a1c8aa45a9d71022f5cf6f0593e866fb416920ba204cde2c9f3498e09b5224. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CH7812532044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f93b6a7b362578d6e7820dbe4fe9077e06427799bae9030d9bcc19785dd48b9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6N2496185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5ee224b929561759a0054995311b478ceb75b0380cbc2e97a3c73692dec8679. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZHN92494175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912292f1e6a063addd6d3d49450f7c21c02b364336baf1410a81bb0f70bdee5b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6N2496192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348a3babb5b6679fb40b0d88a128722f6439726709573817c807383979885629. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6N2496193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821dd693799e75ceb0c58fa4245a31936ba4be8e552efd87198aaad39b65ad2b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6N2496194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7b20fd96c47f5abd98a48fdcd879d6297aee1a5d41f49b0189d81ec80bc2dc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CH7812419969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e5feb76d37c71895f18decc6bb8c4bc6c42bc51ee6fa07270ab39bbd083d1b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CH7812414749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e5feb76d37c71895f18decc6bb8c4bc6c42bc51ee6fa07270ab39bbd083d1b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CH7812414749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ecd8e29a84252dfc3285c6275d3c079c7356c8ecfa0b9703b0f6eca97c52d8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMEN2481425.