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 0x4f9954d68aea195819e97e1e4ddbe33bdb91582723bbda56e378452b02aa3333. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2e53a02-7c23-4aac-851d-01733d008008.json and https://artists.proofprofile.net/proofs/artist/a2e53a02-7c23-4aac-851d-01733d008008.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 0xd05e6c5249fc574ead815ab1b25f542f4beaad5bd2fc007be698b572335b89b2. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZZ7T2484802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df30f8a972c5d99e3916db77ac581c586d87b377b9a3c4604d07af437544d3b. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZZ7T2484803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36462013d276c121ebf1d301a03907a03c24a524ed1cfbb59891ba992d2b7794. 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/QZZ7T2484804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f3b6968b19591e6db0c22d84513202ca4d036a06666b9d9f84b8a7a66595b4. 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/QZZ7T2484805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9cbe29cbcd9c5baae6cd1118dd546297f6e9885ef71bfb6b0f782ce902a8430. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/QZZ7T2484806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbde49786440f752ab4f775af0d956d0f785ed5efde523b0da6eef9400f7391. 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/QZZ7T2484808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35586a162dc6c5b49034ee498684703ffd200ef85f025a99230efcfd41f82034. 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/QZZ7T2484809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb1e15bc2d751eda52467ef652ad9f7306b896c25d677cac06df726d5bcad773. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZ7T2484810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb852fe1c00bd7aaf7be48ca72f7952eb1450f4c01329cdb68866fc3b1a0f1f52. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/QZZ7T2484811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2528830c5350e0586c830d2a47dfd2533e7f19d6e4a8de3598f977c1fbe40557. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZES92554386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9ce6a7e446ee2ee30200c809978180aa7ba222e542047cccd209ae2d91003e. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZTB62515811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be48a859e22df45fa06253918156fb0169ef6be7bd39727a16519c7036d5e38. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZTB62526215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd94093bb5f4a5af6a10196d363c4f94999a25f83d4543ba51b19d35c8196974. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZWFH2590780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a69afd558dfc3e081df0a76f146c0a65cef369bafee5af06696338d604f02a. 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/QZWFP2592280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4764509909ebc4a64af77712f8794da50600d33427f492a95711006066fcdcf. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7S2546894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ed7730aabfde8969bfa665691d7fcbb06f324d057173ae0a96be01df1b1d5c. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZZ7S2585220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287746efe2d1841adbc1931cdd8bd3531b48bc2f062ccd23b34d44d8b51b4a73. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZZ7X2544154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612ab3290b0b0d84409d6e4ef230ff11aa1529a5ec0f0c9be045a1646d3a860c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QT3EX2597323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6d3a7c65998527f6dcd0c3919056b0edcc9fb5987dfef05611339b85b89776. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QT3F42590027.