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 0xd553bfa0aaa27fa14d516e4e54e1a0292a74dbf3c44af0e28c04b42199ed0a8e. 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/2768300e-3f4a-4434-b68d-839f3026e552.json and https://artists.proofprofile.net/proofs/artist/2768300e-3f4a-4434-b68d-839f3026e552.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 0x4c6255f14222a9caacca21d4db3635e444c5fcb9fb6473c9fa0f93a6b99e7264. 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/QZNWU2180628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac656c6df47769a2faaa10f7c89ce5fdc9998628bf0e4efb9ea2a6f63235198. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZNWZ2150638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2bd2907f3dae0a6cce6df2b2e5dfc36003a235957580265537f71f08e18811. 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/QZK6P2210476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb2e470c6dbba46f469a288ad229b73dfd1130e2c2c6a437091c796fb55585b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6M2290633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe498650fbba4e8c72260574f9c78a991888354b7beb16242aa72c3dcccc6d292. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZK6M2290634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd759a26897fae94def04075ad6ad8966220473c35eb02ac1942d78169eca8be1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/QZK6M2290635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2bfd7e1e547d9dbde014767f0a32ba18c8785b99dcf3c3077147cef1a26f06. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QZK6M2290636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8e55c1ec3d183867ce758a3505c0805e40bff1a599c4267fd56960607e2b6e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZK6M2290637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a80a78dacd549546ebc1eca66f288f5caacfa621c2736a7ddae3ce12cceaa98. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZK6M2290638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4302fc12a78c2ea26df55477f8db074aadb7d8dd58085da10002e8b62c85c3. 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/QZK6G2251451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0603dc3ee1f87ec1b49e7aa91b6142e173eee39294567462013a4a27f842f1b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZMEQ2242260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28483476466c6ae9ec958ad1393ead6d1507d1bad20a2ea32a011af8fc7d2217. 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/QZTB72299760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b508ded7f752c04ec683220061d4ff0b8974e2b8be2212cc9f53960fd7bf2c4. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZFZ32361762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b89147d175dcc7df210ea5e055eb7174351f5bd071a1fdd2de89e8f42859bcc. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/QZFZ32361763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c3c45eca3f1252ed773f1815e362ce177e276dd4ea2470ca44d79505c9085de. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFZ32361766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x395dc86d1650e1a3974575542981c09a37559d8bb0118b6dc6bfc9bd5d76c000. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHNB2323827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf933093b84261733dff6b87efeaf6167b593251ee136f166ecec638d1ea6da0. 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/QZNWR2333281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df43457606158fe2f607fde8e59f6fb1a806c0b60ab090a1ae3e57ee1c62bb3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWU2309282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74258f5689ce795fb629c97d1a0cc4a41f029aa74260279b24864d5400edfb77. 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/QZNWU2309283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4cd782ff6b1d0e3ed643b548b4d6fda6019e9e507f7053d55485c1ec47c62f8. 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/QZNWU2309284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b732ba730bd9ba17382e12114ca05d18c6dcfae1fdce4aed9b9227a5afc1da. 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/QZNWU2309290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9e4fbf4eb6142987798642b9238c1865ac6e0aeab817d3f4dbfe0662ebfe81. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTBD2312023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31c1d04c643a46d88320d0935055539636807a166e06f84e60a43c4b6fc8884. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZMEM2481645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8542f3d7276beaa272ee63e749e000b401c080dc9f1a47a6807c87f1ab6c2485. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QT3F92572867.