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 0xd2a1210514bcb512b31d3836c83358735939aeb5b4b2d29729d419055fb31770. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4bd2d800-b73e-4a64-ac73-56208cfcbf70.json and https://artists.proofprofile.net/proofs/artist/4bd2d800-b73e-4a64-ac73-56208cfcbf70.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 0xf1897da67d1bed8e926e1fd8340afbf7c6ac0122669c00cc15c7c595a11df43e. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZHPJ1975340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x141c8583bbe072604221b4c5ba8514df6cc1024887d9a036b48e98ca514aab0a. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZHZD1951139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x528080e5b4cdfe2ff31d40f251c0fa000c899c2d663c97efec44c46528ba2452. Chain 2 (Bitcoin): anchored in block 957529 (2026-07-11T06:30:13Z), 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/CALVP1927025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f6d03b249a150da78f9b1ae29906fb4b7d5f13e9f548265c3daf0c58f91e1a. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/CALVP1927020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fca44222309f25f07b054365243f0a2405d49d8704e80b3f3489e4e46ce891. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QM8DG2092627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c697025ec2624ea4143983bdd14a612d35704bcac28f63a13311483378e75b. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/QZF8N2070293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2e67369786a4137278f87d583aaf28ef5a02633ff4664cc4e63818daece28d. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/QZHZD2030300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ca802cf4018a07e447fb2a345a0e14500114937696164744381282ce9b441d. 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/QZJRC2025373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f2ae6166dc2db3a6d86d8d8d8173b90f7ac4814759ebcb9531ea72fc5621ac. 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/QZFP52103710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4111acf33fc742f321f0e39916580471993a11558d7434baa60a515a49bf73. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZH5E2164971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125d57d0c7a87dc8ad8e65a10159559c0e39912d5afb906540512dfbb4b99896. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QZTH92107478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff0f674ccfc94b49f2d83d3ce5f6a9055becdb0e44fe7379da8521d1e33d8d6. Chain 2 (Bitcoin): anchored in block 956775 (2026-07-05T10:41:06Z), 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/QZFP52227798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37be888ecad9928a3c4eaa82d7be3c3d003bc7e2f58bd9941344aa6d985b9e6. 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/QZHPJ2235030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0555b5de4afb4ad6b6cc0083b55556382df28371e577cb25487c03e5dbadbb9b. 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/CAHQJ2410708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e65db0bd6089062e36db7d8283dd750aee1501e5892769ed3b3590457bf56c. 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/QM8DG2484079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a7bd070672345fcb956b5fd7092b77ea2acdc2dffbb71e372755e1892979fa. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFP52363871.