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 0xcd5a999b4f81a4521976f7a31cc2dd5701f5b63e0eae0231759976853ffed30b. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b82c299-dcf4-4043-8151-a6d5d89e7443.json and https://artists.proofprofile.net/proofs/artist/2b82c299-dcf4-4043-8151-a6d5d89e7443.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 0xb5845382cd692d480d36769d61dddf0a44748adee8f72f046540e40d65f8fe67. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLB150500298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c43f9182cbb4839976f9246b806dbf2e293b74f5a95783a840e7d66049a98cb. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLB150500304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8f0b0e8cfc631cd785b3c5231b992f73c9e2ccd63158d6a1b647a7e6dc53a8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLB159700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79eff876f71970f4e20038b253285e875c3177efa4855cfa0c3e82f5edcdd712. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLB159700065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e176bed6730444ff15135a7a52a18a4838c72ea53f5c943fdca4ca392c820f. 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/NLB159700066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a61464927f6b3431eb9b4ff844145b292831c68796ebd31fd2074829c2cf409. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLB159700067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a5b556418fe5b7873e2d3f719b5ef64dab73a601fef3b3cb604fb62ab3b7cd. 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/NLB159700069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb23a9c64cd129cd371574d3eeb5a07a7b2617ab8c94ac72ced1529c7f8e92c5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLB159700070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0a79795b08fa935d90d73d439d95b82af89f8e31f1c08750756229be70e4c6. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/NLB159700071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e21f3e544db3982b238b034c23ac4aff94311884b743de5a8b9b537f677eb6. 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/NLB159700072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd958db09c69d2d6f2bd20f6cfe17cac3f41b862f06e6c45bda1a319b6b9f678. 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/NLB159700073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf4c96a60a83680afb36c7940af1ae8417607acff9dd5898333b36b7f2be3f1c. 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/NLB159700074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3baba2ed9678f546bf39629d791dac7ddbc62998a1f179a615434843e50943f3. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLB159700075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ebd6925ccdcd81d03452df488f615e15a48a776f985ff5a84e85dcc3573e8db. 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/NLB159700077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b8c93ce4d0ee500f68701dd28664be4ca724f61dbd57482d015faf44e673d8. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLB159700079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a0b463dc77dfd51f15297a3b0f56840cbedfe016336a3548d45ff5f9a8df3b. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/NLB159800043.