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 0xb11b7df4327e612c8483833d69aa20b0b9c74566af72038bdbc4aecb58e98ed8. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/893428a9-0f95-4c2d-9e83-42076cd0941a.json and https://artists.proofprofile.net/proofs/artist/893428a9-0f95-4c2d-9e83-42076cd0941a.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 0x3f0d54e089b0f4fe829d037cb35c27a474f41ae464df688a705510ec57583501. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/FRZ091900141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7645e882d0a13ee3416173b180770022d05616397d3657cac1ab50d4c4d90f58. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/FRZ091900142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5beced573149d80d1e7ebeb9e55ec994682d0b11ddd7c2c8a026515f564a19c8. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/FRZ091900144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5a5f7662f5ae581ee564c275cad9b0e1ca2c038dce396170884cc9964b467f. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/FRZ091900150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f2476cde6538e1fbe8272c1995061f1891c9be0e108b8c9a7332bf55ebd06f. 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/FRZ092100282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4f2476cde6538e1fbe8272c1995061f1891c9be0e108b8c9a7332bf55ebd06f. 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/FRZ092100282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bdb995d00675a11ee7165b45a49701a0baed75df765e292904e5fea4ff6173. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/FRZ092100283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ec88117d1d9046060fa09a1cebfb4e0cf943e732cc175796ba68b87b4576ba. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FRZ092100284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ece5f9cf5cdb895289de8749ad30bbfd85cfbbfaaed6e29e4f387182f1b86f6. 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/FRZ092100285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bebd704fe6e18c2e3b065226de2f83619f340aee69cb9a173f231ba11bd69b6. 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/FRZ092100286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6942efd5871bd4b06e8bf350a3c141f8f1cc7e14cee4ebc670d41b5be7d92dc. 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/FRZ092100287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7050e640257cd48953ce9cbf7bd473befca9e9718db7a4afe1a65bb6da6e2525. 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/FRZ092100288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efee19b9896a8be36327044e8084893cba8793eae2b793cafb7349dcd03a66f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/FRZ092100289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b14326da6a2fbbf5891de2cd7fcb1f49fb5fb6823d601ce2fc9ff5925f9c8fe. 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/FRZ092100290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e77981f516cea71845520d6b51b80eaf04d997809bb2f012eb04310ff6b741. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/FRZ092100291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef7369b8239453db677ff568895ea4f3f82c576a09e2028d0be8cdb983c4362. 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/FRZ092100292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ba9851e94ad866cf2b3e0232dd475f878bd84a2b43f788ba3efe3086d312d8. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/FRZ092300362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9caa346e0534098c969b5978caff661aca53c8e7c0cdd8de5339418f776b13a5. 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/FRZ092300072.