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 0xcb32438d33e22d6abcf131d5ca3064146633bdfc1e24b2f04984fc0bcf40e0ef. 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/b8641399-a347-4d55-98ef-0f603dca78f9.json and https://artists.proofprofile.net/proofs/artist/b8641399-a347-4d55-98ef-0f603dca78f9.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 0xcf1e318079c185c2c7cf4ebe21ade25c69213ee78aeba2d98f01a5ad7d7ed432. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZHNB2473673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x163cd706f5485df49842dc83f025c65b5100cbe1af4a72c3574a1d60f02e795e. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZFZ22431715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x444852c56492f511895c4be091ab26f7906c74a6fac46b0eb8bcc69bc06e91c9. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZFZ22431717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5217b966d44a6c4d6fb2f8cc2e5670b0bf384a064d9a6f07aa4678465517e7. 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/QZFZ22431718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fa682f440a6f8a13f67ae1064e4c85846ad50f4f26df160da7efb68f088a316. 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/QZFZ22431719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85c4c9ff1b3b0c2c3674da5fba3c5d055a10ad6e9c91440b1c1702467132de1. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZFZ22431721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a659c889441a52ca2849ff49d4924f834455156effffe2c28928c40f43d705c. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/QZK6M2439948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c8a3e7fd7a0ff60d0bb2bf67b51d3f54209073f3e9554365569cac545a6e88. 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/QZRP42428754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36fa41a4ae385b2e58bb0b056a8821f3ede1c46026429f8fcbe48174ab2ef4d. 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/QZTB92422400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd618206a83ecfc4843f1b78ec1a108cec00d9a85cd202db4cb042099de2a89c. 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/QZWFR2486174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04593eac78f41c47de0fda9f7c19d88ef660d40ff6c2cf6bb01d58ef20716e69. 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/QZFYX2587913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7670a2645545a52fac97af04034923545cc6bf24bb132a9e6ef8c340c5172e6f. 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/SE6TI2350066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed369069e17bdbddf31e6420382f5a7eee1129f12f9ebc3dab80ee7506b031d6. 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/SE6QE2391267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94b70d71611cc12c8981fda2f71e2447f9db02d169dd3723380bde92af052424. 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/QZK6Q2452357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc1a75b950cddc287eb50609da0de0454a9f4d0fc51a126c1c19952b71638d9. 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/SE6XX2263176.