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 0xe75c9ec15799cd33fa50d2f297c961a47c77a58732af8d0c4bb44097232f3048. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa676db7-aac9-4d39-8479-6f6594b127cc.json and https://artists.proofprofile.net/proofs/artist/fa676db7-aac9-4d39-8479-6f6594b127cc.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 0xd41e3decc027022a3d3c926af628b470e7914b75e7fdb69154e2843cb6803163. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAGJ2253597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccfef68612162d8cba17ba8eac50dbfb4ba36ea2e68fcf929799d2158c2f225. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAGJ2253613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb7ad0c05a15217ef9554d24b96ff9cfa251352bcdc07fc3d035536e0776ad7. 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/TCAGJ2253628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f96579a61543bcb9ced5f7de2813347b6a320e759aaaac2b669c2159909af5. 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/TCAGJ2253640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a1a423e783db790489d37ad2f9e39d57c850ed617dccab70f66b3a7350fa32. 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/TCAGJ2253654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea66ba623a1e0dd7941acf845d37aa3a722405071c09a298a0f0daa3627348b. 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/TCAGJ2253783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693fc70d2d68bce08823ef45bc2bbff86904bd7221b85175f2bb7e203b958f94. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAGJ2253804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6060d63cb99ffca4b30aceea5a4cc612128e4147764725d03568ec4ad2ec10. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAGJ2253817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc933e497c1b916d435cc5c4517ee76b385dc77f90f368065d560e43a9b309e. 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/TCAGJ2253859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9e2f3acaca3972be02b61e3f2be0ea212206acde05b60a2ddff7023b470652. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAGJ2253877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61dfb76fbf9ffb38086f59d0db334446e85d91cde8280931c2b34905ec3cca0. Chain 2 (Bitcoin): anchored in block 958579 (2026-07-18T16:26:17Z), 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/TCAGJ2253929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe678dfc20560a8177847fe63b0f85347a7b8748f9278c4d7c9c9c2beb53cd899. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAGJ2253934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71c2678156fc467ef1a82d43b14e21e5625ac9ace9e301a6e90437f184c545ba. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAGJ2253939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507ac34fccbf7c9da757946e08f10cee6dc798317f7ffcf945845baa5c09f2df. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCAGJ2253943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dafd488f61913b63ef795057cb47cc9c8a4f34509c829a3acd384e26bc5052b. 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/TCAGJ2253956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc3197f266653e4138c3825cf79b6529f1fae6e4bfc7d15982f76c66695110b. 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/TCAGJ2253963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a625d8b9292a9778eb1f913eb0f8e30890c989eca51b506076e570b8f6431e. 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/TCAGJ2253970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadef3350c58fbda01b0175a7160fe6a08eff2ba513c2a5aa880af5ed552f9383. 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/TCAGJ2253980.