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 0x7d7f05bed7d42d72a19e0cae1fa4a4b10fbc8901725bba5bda4342dbe2db9967. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/87e787cb-b5e6-459a-a8f0-b787e23d634a.json and https://artists.proofprofile.net/proofs/artist/87e787cb-b5e6-459a-a8f0-b787e23d634a.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 0x3b1b9a52653877b5513701d1cf3ac3c2d52df72c8b68f230915f92275e62b295. 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/HKG732305338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274e206511ff4c81e9c367e8466625ca1aa863d99c18c9a63186e1d9a2bd0ab3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWDL72300890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c797cd11b09ad1911cedd59f1b4879536e94d1ac5d3c16b729f4b74258c48bf. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/HKG732495274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2b2688185b7e416f17ec7bf03e92c4e74424315950848cf5458f2602ce8c94. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ESA012470825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf2adc2df4b320369a08621eca217e6b20d39a38b72478df305c8fe5f2d5cb4. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKG732428410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53cb0ad32dbf8e518dbd7a2490cbcaa4c12add462696e4e1919f9f6d146c8b8. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HKG731682792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb98e96646b0c04c92240a93be69cad077df81d2a96b09bd078feddcae73295d1. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/HKG731676334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a84f299d27e34d9a868c50d68264b62d69c9e8733e7eb5dd4689a6cdafbe226. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/HKC992324472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffa04404c32e90afdcd635af60462fe4dc84d3c37d1e6c57dd06a6ae4588ef0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKC992324384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4150bcf4c4681d18ee9cc68bda4ff919f50dd5361c16187150cc16a829677bc1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKC992324142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3780939e9c92377a7e06d54cf63969744441135b0d6ed10022b0ba57b6a2f3f7. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TWDL72301441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f0e924d55e3b0ad2ae06124534fe4c7448198cf6ec122074d167e857d2b4c3. 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/HKG732305482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348ef3b2546194077a25cfbac13eba9f3ac834ac175a99f61bcb156b3cb5fa40. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/HKG732289301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f4770c3453ff824dcf2b329ea0fe3eb412a1c81c1f8d7da3744f9dded71691. 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/TWDL72205989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0913b06e86e8ffab0b95ceeba4ea218e0f76f02493f757c023325c6bd255abf3. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TWDL72202031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e364e988bdab8d3a4b89b6dd4ba62f481c1337aa6f0951aaabd9aa748443c8. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/HKG731761897.