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 0xd54a97961404f293e577cb1d1c44e05d79764d069fa4f3dbdaf23a5823fcf58b. 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/2aff3765-3524-40b5-9f69-3a0c39c2fcb7.json and https://artists.proofprofile.net/proofs/artist/2aff3765-3524-40b5-9f69-3a0c39c2fcb7.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 0x7ca47e76530ecc4e85a31c89f4423dbd0de88b5a7b6e98f24f0e2b2f4277e076. 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/USJ3V2137773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d06eb85afeaed990c777968b2f333be7cce1847ee3564cf0dd973c8732357d. 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/USJ3V2137774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9786ee2cf9afc52e85fcf8e91ad0685ad230ecb4ccd9f7f5a886da629919de6e. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USJ3V2137775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7722730237168699ebe8d9cbb6dbf72b543af26f7342d2fb361f7b8d05c4c3db. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USJ3V2137776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48dd4225417d74720e0f77a2c6a41392094ba61adbddbb43f40c501db09cf78. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USJ3V2137777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf685517361ea10f58c07e3208dfcc2572b41d4bd371d98f933b9ec47facf6738. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/USJ3V2137778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8e7876d637fa4702fd5029b5bf93fd20bb9e49ae4163485143b27a755f960a. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USJ3V2137779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d2925f1955f12c7593c248d9772be5925776f9e3a4a76afdd9dbed61a47849. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/USJ3V2137780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd222803637d4e014e49183bcb937632b8797196f31ee71d632f5358e04a86f. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/USJ3V2137781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4454d6e1fbad64f3181933f1689daa94abd26968f481e2652529893b6077249. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2137992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3dcb9d9a4a29e105638a6e429aada76f3b04acd3915783082aa5bb0318c41ab. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USJ3V2137993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0c78c36a26bb27302c1b3ec0b6a6c030a3d9eaa300e8bdfc13f8165dd033cc. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USJ3V2137994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa969b1196e4a938f8eae702db075029ce4499df8e7cde2c32eb39a9e1d2f27e5. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USJ3V2137995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1f51c1f17898926b2f41e6dd00ae5cbf56406eac39f1fbe3efc55cf80150b1. 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/USJ3V2137996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b3fa9740ee0277193d1cedcc0e32380d36c8e52b6a90299e8dda7d5761fbb10. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USJ3V2137997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb047b75284c98390a93fbd535751a4dc1d74a47f9bd70b46b43d6d5fd5e2fe89. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2137998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x445b2945c6d17ad8262792931abe2576a60d361a9810955e924d6e8ae8d1226f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2137999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a7ebd675cf5c29fbc475e2e85a9414b297f0b96daf5869ec4e47f36c2840d3. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USJ3V2138000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae55589a02f130f2805a4f0be02edfa540507a936a64fe291a0c761a8b2cba11. 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/USJ3V2138001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052a555b46a7c5e7f8aed47007ac7009e9110a5ea2b882b7b3e1dce9f20af2e8. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USJ3V2138002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109178a95c07082c4b22dc18fd8136d62254cdc02ae1bc765c7730f2f0647365. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2146638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdce580d7142cd0107bfc376a3f650e06584c1be38ac9245d0fcb97444f95d05. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2146639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c26ef1032fb8fbafa6bd09793ab99f8f746549b4db895fba024cb73084961c. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/USJ3V2146640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe027c07e37487c3db1bd73660356a9c64b2dd7e35a2ce7a0f1909793956f3e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2146641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8811181ec6b0aed67f6289bca6a0200ab0b1dc723a955cceca6a9771b75ba2e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2146642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5cbf9a661950d624a1a8c213b4e715e2f64863dc9e4f88a6611649b2235a1e5. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/USJ3V2146643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1794ff50295acbec9c080748175406a2fd6a82f6a4a3fc0f5f811e9355a6677c. 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/USJ3V2146644.