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 0x02bde56f947b6c75744a81e7a0fb42afc94f4664a1ca79a8b7685bf7148df6e5. 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/1e54a0fb-f4e9-44dd-a6ca-53987855627b.json and https://artists.proofprofile.net/proofs/artist/1e54a0fb-f4e9-44dd-a6ca-53987855627b.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 0x14e0c9a59a4d1be10158bcb9b428b24a84ecd82d5a38cf03dc0945df1b71d11d. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QM3DF2251445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98acee86d4ebe5be12042f7c33470e595b47288599de5167ae87e682864ac765. 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/QM3DF2251406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb3e68726e5c5d7fb1b52bd749a9eb5cf1d6b72c69f2f6759512a888369b712. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QM3DF2251534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16a3fd7aa6729cc6e5eac354a9994591f7e6e9e32fd5722bd452784e5e4e6c63. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM3DF2251529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c8829ca224c1056b6c753db4fd70d8351aecc483d37c5fe261f3c2f7e9468ff. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM3DF2251468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0974ec925218b52a5db1dc902fa693cef41098ed57e6012128619d3f50f1e944. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USANG2436895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8586cbf0a855fe3aeb7ceac1174eb4afa654f1035a7a3f5eb66dace609d8a730. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USANG2411248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c0b6c178edf655b20985a9ef9224ca7d82460a18f7ca4394752d80d57cb10d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US3DF2473495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2585e201cce8b6d6a2fa6df4bfb8fb417370fc59d63903135306c40db6780f9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/US3DF2423864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b5a2b99a2fae1ab94191c99251806395a1091b2cd3c7d08c91b0cdb8aa0f48. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/US3DF2427311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3306214704b3d9a34b8945879a351fa567c40495964499587c1f7bf78e0d816e. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QM3DF2484653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d517bb66e7dbd2c7816bb79b07ca012eb954e4b5cf752b68c55e56c508489b6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QMANG2494012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2c65da49351fee4235eaaf5f72c31160f6d9340da1419b412f8234dd2b17f8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMANG2227833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363a208257334a6ba2b0f32f41e279439d940ee5bc3f57b448f6bae7ff3cd3f2. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QMANG2231767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7671996f4066a1d17a321a07721896981ba3e50c55c178a58ab779a84c805653. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM3DF2257321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40c3770d5317b46726dea6d4d1e1f1e0a9c9360b926a5da67d2139213047c1b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM3DF2250869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58265da6758d5d782664b256244c6021026891cc10f0a4d9f0109e41464b6bcf. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM3DF2251403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb07402300994a8888732de8a5ebc0a0757287163bc42c7cea743d72b93b8da. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/QM3DF2203369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99372a67cfe0ad139a2abf6d5c17d7ba8dce3b7243762381439c264d7132df2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USANG2272483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda03b19f74596ce28361d2ce7f33f966d19ee7f170e0428e42261b6a7f6b1823. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USANG2208410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f3bdaf09b3083307988f5c228588b93554cee4b6ad140adfa79a208d10a17f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM3DF2203365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce3d56a11bcb2cb6d139f043a4df0831aaeaa1cecee89ee84419c436b6b3c80. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QM3DF2250608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f7f632b6614938783e9c9fde0c809e44bb995387dff95d66443ab1b0b75255. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM3DF2250931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2aa7613a2f0bcd4390557b9b10c7fc75066e0aeb517dc755fff7f6e16d241f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QM3DF2289981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee678038802bd1e937066479cd0b24fa09a1438ad4eebc778addb50367eec3c2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QM3DF2289953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5457cdc471eb6bb44ba8a8e0c59ec554588ce582aab1a32c8d637753d73132. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM3DF2289944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec2a4c68a2b3db8611204b3bef011e70dc6a918d961a0bdd966779162b8f318. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USANG2272509.