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 0x336f3186406b36003bcc5ee06db8c228ba8e1902662098670c29f3053aaf6875. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7faf3a9-9f73-4efb-8bc1-98d74b415247.json and https://artists.proofprofile.net/proofs/artist/d7faf3a9-9f73-4efb-8bc1-98d74b415247.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 0xa68f52d078995249020f007f0d3be8e275cc381db5ffb83c2b1d74ef6643ebdd. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZHN81960324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7240d5c593c3d3a9883e29ac2b06b7f65b7c34287317f0a0e849b0eca4a53ffc. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZHN81960326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6861abebec096c3e9f8aee7c176f19441e38682bde7ee0fcc1cf73b2cfc948ea. 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/QZHN81960332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767f727f382bea9541e0a36b133aac26effb2b66cf20e3d957d874c1b8e020bb. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZMEM2018830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef67a83d3827673ebd0f83e778285e4b6b5bed64499dc5f85eb5c8e5a64f028a. 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/QZTAU2106007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a2e824a5ba4458aab0a5c6840f6d6b7d31712e9de061763fa7e9cf961d3f52. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTAU2106008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1bb8251fc5a7aa051adab6b27fe89ab0fd0ae285bf4237f840862903a109a22. 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/QZTAU2106009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe10004203a4519b3ad8b52c4570aa5ee93d1df03ca3683ce999ce77916dc746. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZTAU2106010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a4994d03be4a449b33afc5a4512a3e398631bb2315cee43d02babab4214b9e. 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/QZTAT2114696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1477a95284e623655c11f19e644f1add48065a54dc8085ca1be65a03eca4666b. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZTAU2106011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef7726d7dda34be6734b7672a49a7e5ef2462ed50d185fec79a020b25596e57. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTAU2106012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e17f488329786d033eca687e653b277d6e9990b46cf124e9a617d978719dc6d. 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/QZTAU2106013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18fd22cf165129be0c9445aa8482e1553470aadd45e656a0fb502cdf217c5f79. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZTAU2106014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd0a6f6b590eca71db5bca922742b3b3add977ebac490d1e0415681b206813b. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZTAU2106015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2c6813f1c26d3167d38f030bf30ec5ab1d06745d250d2050f36185ae11f045. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZTAU2106016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7e6385fb7072d8c7708111eb0c7074c5bc136610cfb0b60a964d5b7130813b. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/QZDA42567707.