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 0x4921225a9af31253c7e447bcbd32feaf2bf8fcfa727da6fe4bdbc7185afd840e. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e5303716-8418-44b9-a2e8-0767485ca08f.json and https://artists.proofprofile.net/proofs/artist/e5303716-8418-44b9-a2e8-0767485ca08f.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 0x0fe92226b421420dca0a8cfed57ab79bbd57f8bb186fd58aa3fc4ffc8599b7ac. 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/SE57V2403329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42b71f867ffbf9867fc3956b6d9986f9e4e68a382bae6bb2aae155e2bc5e3bc. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/SE57V2403330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3cbafbf055664a11ecf321deeed0a2bebf5db79359597192c991d9519b3810. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/SE57V2403339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec4599f3850d39f41ef1a749510907f7c95cbc63e8cb242a03f3e3040a715cf4. 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/SE57V2403340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee98f1e2f27b12b54013685f73b83d4826b4fea18625585939f29b8b0d9cb18. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/MXA3V2400242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf1b46ba95200328bf02a6a4e88187afd2ce5a5f2dbcfe1e5ced5f6d879556de. 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/MXA3V2400243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397a3f83a54861e0f8f1f9697f354b607661672baade5ec78c1df5e11edb1d6a. 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/QZMHN2432953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff536c4076f7723cbebca63f1e11d90c64f4c77ca46d7a7bc42f7309554314e2. 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/QZS672483630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa50abf76fe5d0e596171eb03d95a745fff6d37ba6d4fc78bd11bb7c09c3d4689. 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/MXA3V2409719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6713b82b099a51187839ba22099bc3c42e28d7ff54bce98087d6dd155a4a11e. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/MXA3V2409720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc065f7506ecd7ae703d40a11261db17724f4c2d8c6e73153f4b73be172418e6. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/MXA3V2409820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0dce316312f7e379b1a90acf11008e7825aa233da2c91cefe21e061ac5f4902. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/MXA3V2409821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea98fcccb0bd885d36a2df470efc31c0524bbd12a42da6da55352087176359ac. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/MXA3V2410087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bc17cdc0adcf321970d138229b93e7caecc768f6e2d73061f6af1ca9e62cf93. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/MXA3V2410088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bad2e70ab4f5da1efb3d5993a7dd8856e0519cd3bd46a2156502570ae46320b. 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/UK6822419809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9657d11a1f21f7c5b0d852d409d0848cecb8f73dcd7afec78ae3cdbf25cb476. 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/UK6822419810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01500ae11fddceb75b48790c41b66f8b228a63851c49183fe155a0d4c9bdd1b5. 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/MXA3V2436662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3adc03e729eaf9e6640a7daa49248dab16f462e481a1cebaaced648724230cb5. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/BGA472518757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb672085ee11be1fd512d11cc7b60ef5cc299d68365217d6866e1f6495347df6c. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/UK6822510890.