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 0x37c890bcd80211d600abe4c1a77d56f59e6c73c154e61d3393e5010c7be8c5ae. 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/aeaf95dd-ef23-4801-9494-4e320fcce6df.json and https://artists.proofprofile.net/proofs/artist/aeaf95dd-ef23-4801-9494-4e320fcce6df.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 0xa88105e2a0cc0a20200840ca745a49473ef3f493111e2d708409476fcb9d8417. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZGLM2457869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225c25cb615642a3738bc6a499d87614760bccb226b2423ec2a83d89c32d1307. 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/QZNJW2482482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c7d2e1c5f1c8220026b22c08122db37d1412f26c65164f15fe4506487d3795. 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/QZNJY2415194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1741fbf398cfa42dcaa3777deb9fe32bcf84fd0d8e78151750cb84366cb45005. 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/QZNJZ2451224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7daa512c4469097146c78c49d0cce0bb7876c2ed98fc1e5f899b7655717c63. 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/NL9KR2426969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d51d0d900f21d6fdc3b45d7c80474ace3246b8f73f13bd44695072bf42a0ef. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/NL9KR2429057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9472c5a982b3db64a18bd51bd4b5665cbe5683bc07303c95b957a772852a6e8c. 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/QZHN72510394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63f931ff715319bf16dfe58c3a3dde4a02f3ce6ded39a8600cc82e810218cff. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZK6Q2553471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d45c15c14d926018455c77faaf56f80e4291769f25555296ff5ef228a3006da. 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/QZMEM2593198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffaddb537ea5fb9e551ae92ad0945f54f6c9e86202d7d94deb8935b283b52622. 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/QZMEP2570644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6b6d3a2dad76d16d2b65990aceeb3bee202a6f8ecfd3b76f6ee9a3ad26931a. 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/QZNWS2531453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ad6c779827ae1fa76cb96a416d6d7bed59cc0191c652b7e1f826219b63ecaa. 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/QZDA72526943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c727557ac60425f16a3148fdf5dd7658a302aa3a46a77d9cab0e4f5eb3f51d9. 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/QZPLS2595520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4723a7c400b732e7d5607c4504ae675f0cf2dcea4f6f3f997cf3d6b8914e8059. 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/QZRP52515343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60613450341a64a3f438fd04c2e602d7af1be523bb23f84740f88726f7b8631. 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/QZTAU2519064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d90a111f80bfe81ed1229b93e6c41737d6a532a21098a655026897df7d13f1. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZTB62578217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0bb1c287ebd480938d1ad8bc6ee929e8493a79491223b7d8301abca300a92ed. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/QZTBA2500560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a7cd728d3d79b8955652a93c659c84f0a1119cc8d7907291f2d50444e3f4da. 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/QZTBF2538116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e8a46f426d1fbf24af43b2771b6f03d8fd2c595e254a8fa245d7eb45788e8e5. 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/QZWFH2590720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3619e6e59c246f270abea010fceae02d45026f24c89b576a3f5d5f9cf90abb57. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZWFN2501612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961c820bbf05ae69c20721171b9fd33179561a39d94f6f2653085448ad812920. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZWFR2598348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bcc42529c726e42a85fc8cc58af6cf13a0ec688b7d1e50f054edc44e226c0f1. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZWFU2550500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fc69f352d89db635e8cf1953a8dac451d4218cc65e39ab0d5363eb3e0e1f3a. 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/QZZ792525036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1661530f424d920dc54d3bcb56c5dcf716183fb4bce619f42937f36fb223c30. 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/QT3EY2587089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059814bdf75b0b8344784ace42074ee4b5ba27dbb27772dc3b360adb6cfcb760. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZTPX2568205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0d9165796d9f0c6ccb206bf02d9c920add6f746b8b894c9c5204f33d6058a0. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZTPX2589830.