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 0x7e05599a1d0484fd52f5a46a64bb7d834ab139b0e910507f2c597abbcd09c98b. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6717bdfb-52a0-44f0-98d1-33dfb313c306.json and https://artists.proofprofile.net/proofs/artist/6717bdfb-52a0-44f0-98d1-33dfb313c306.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 0x1dbc967e6aa6f4068efeb04b51d4098c73da1969d8aeb2fe8bcdf627ea4bccf5. 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/TCADJ1714393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba699f199c47a0278c9e267216bcce8cfc4ec5b4f6af97ffc43d688da83ebbe7. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/TCADJ1714399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7528fb17a88917fae1c0aa802671e180a7ea1bd6ec583b849317cb5863ee278. 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/TCADJ1714404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4318e770900ef1bf1b5f08b490ea00511b6358181e19e97868845ba04036f72c. 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/TCADJ1714405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c557a38db92326c05b9fd0a71d67b071b007e10d28d3828382ae60b08f03215. 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/TCADJ1714408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04f239ff6b77243693c9464ff8b55f34ab8ab7af4a507e12bc9f3ef9facf75f. 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/TCADJ1714412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89afc7495469b4165ea1f4d2780f81fd9c7ad011bb12cfdd3ebcd18d1868b84f. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/TCADJ1714415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb645c1f6e4bc4c3391855ec88b5317d4e385723b52b852691b6ee5a1386bd736. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/TCADJ1714417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaddcd997180b1325d708df5d34cb6b290c4c387c794524bd4bd4a36ed6b1628. 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/TCADJ1714420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa64627f9f33af664c4f2fa522295d831c2b01d4f7201923384f7a7f9ca985a. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/TCADJ1714421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e98ab391f9250624df33fc98e5617caf5cac0814915aee59470da565f9ea52. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCADJ1714422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda3988822574a115dee869456d716f755efed7484ae82cea7f19f979abf0abab. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/TCAGE2289261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ca1d271a43eeda731341eda97aaf936ca0ff9b8eea54472ab1e7dd8247bcb6. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCAGE2289266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c20f2d4cde345597ccf784196518d0df1a4fa8d51419e4b1d3b3120854044c2. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/TCAGE2289269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd76d4c9c46e86e46cb2a2deb32fdb4790ced0e7f0adb19a4e84cccb6e03a06a3. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAGE2289271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x876805141e785a018042b17fbfbfc5619e8018bff65c11ed6f7568e450288c91. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/TCAGE2289273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17611fae683236b2bbda01431b8e218df704d29e4ff25aac2083210b60386ffb. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAJF2519116.