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 0x2d2852213efcd5f315d897151c0a7109534ca79e70641bf2512ac251bbd8d626. 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/7eac58b3-9f69-4435-a775-87a8d9b06375.json and https://artists.proofprofile.net/proofs/artist/7eac58b3-9f69-4435-a775-87a8d9b06375.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 0x5743b53c90b67fa87509902c30d082047594d2dcd7b5deb0486ec6b955f5f392. 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/QZWFU2569557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9244c8fe38e6f99af7040be08d5f5e11388d1839db619b900498c967a3ae45c. 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/QZZ7X2535054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90af7851e0c5889d1eb1d74ea6d66f43034a60275e85e85fcabbea7454961c2a. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZDA42149760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0adb95f9f6f61a20ba469a613095f90efe4ef155fb90f2a1f9364ece49fd6386. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZFZ42236735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bc2efa55ebb6df5537ea4e3ea423b04f1308f62c7a3768f5804c141f5d7d9d. 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/ZA56E2250066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5195f89bc52ff21ed3d45b5494ee5fb781af49b818d6b1722c996d52b9f463e. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ZA56E2250067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bc36e0dae5f5720ac7712d8d365985a2aead3385ca699eb00eae9d676d8b7c. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/ZA56E2250070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61bc2efa55ebb6df5537ea4e3ea423b04f1308f62c7a3768f5804c141f5d7d9d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ZA56E2250066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5195f89bc52ff21ed3d45b5494ee5fb781af49b818d6b1722c996d52b9f463e. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/ZA56E2250067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bc36e0dae5f5720ac7712d8d365985a2aead3385ca699eb00eae9d676d8b7c. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/ZA56E2250070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0a3dbb0c35cd621e96de2600fc845a49aab270afcae26e010fe5d035272ba2. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZMEM2258387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336e06495a4589db0cd258e235b71118b6c8c17b6bfeb03946335c5946bba981. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWT2231782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ee66d09a56c1cb716098ed0f2b10bc12183aadb7a4a8b1dded59afb55ae84d6. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QZTAX2391283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabd75933186d47e811d7283117dc01c3a48e1b7e8d034f20b929e1cee751b317. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZZ7N2485064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea277ee31fba63fb26a3e24e9c96372fbe45b61b1abfa796376d723ba847a38. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZFZ72527947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3109d53ed720d57b78313a73a5fff3e5ab1e836ba297efe492b54ef5f9a38c33. 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/QZZ7P2402181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2d2aa043ebab3accfd4566235b061410798ed48a2ae071784c37abda3ec3f6. 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/QZWFM2418447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586eaf3122c879bee57b4290f3e1330a71f8f3aacf728c7c4163a9d448f2e402. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZTAU2554385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8abb41dae2dcfd0d6014aee6f4e819f36546d25a232a181c55677bc3d367137d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTAU2554386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03d17aa95234739f0f535ed56dab131acab65a70d34a9083d1fe16895548e31. 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/NL8RL2405508.