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 0x4c4102c291fbb6e8b0b3deb44098fde2faad1395d91e730f291489bde045cb61. 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/2f4416e8-86be-4f3f-aa42-ab3847a61f96.json and https://artists.proofprofile.net/proofs/artist/2f4416e8-86be-4f3f-aa42-ab3847a61f96.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 0xe0cffd0cd0da0c640672035bb7bb4bb19dfd28d5daddcc1a84277dc2ae57a43d. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/SE5752480075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47031cf2020c9f2e26b3bbddd6c45a1558e60746936596f52f8469bf43208d86. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE6I32434047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe30836e10869ed43d5bdae3e62717da209a1b32ca07d951b95440e3739d6c5f8. 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/QZ5FN2110449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f99a7c263aa97d77aac84562a9e671d971f7d38a07c4deeeb3c98c0fde72986. 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/CHF032408898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dfc484d3834f3270fd0f4a0fd470e8eb872fe1b549c4965d1895bcd7abc3f6c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHN82067294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1ea3d9134c63865879921a17f1fbb19b336cd01882a76f79c3c7b2b16b5970. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CHF032420673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d9d7789596cba1e8c9094224f07b83b73fe729fb5e89dfc1c76d74f1f54216. 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/CHF032420674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d24c1d85bbd815715bf470934ec7de5b720bc886a7352b37d4fe5251624058. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CHF032420675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e743725dd6422e3cf675c3aa82e20c8f73605e38a9a46c8a7809e60ac3c833. 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/CHF032420677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659274f053bec181cf87ee4cd1a6ab2e3d2526b7504de95d5741794976b22e29. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CHF032418848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a2f0d769ce6ca58d2645d500876d0fe798420834a515f187348d2a4018821d. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/CHF032420678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3000ef5c5214c1e8b6bf2a12f3a4ab4ac81a9867e3deef79bd7f55d683456635. 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/CHF032420679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97164013cdc0e7974d890f41c1307c32c703fc227a7f2a7408e171cccc963cc9. 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/CHF032420680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddb844c9169f4738b4ea12e6ce2a3e81e9219f36fd52175de7b34e06940d7ee. 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/CHF032420681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d27f58ce0ac12938fe7ba6a5770286e551695b1a204eb5c1ae39bb60ea3eb67. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CHF032420682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6238b5b312b6dcccd72e4c3b3bd585de8ecad982c2469e101ba28df72aff2f. 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/CHF032420683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2966d65feb5d5650e366a1130b6277c4963346cef4473a2bcab444d0af6ce8. 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/CHF032420684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3341f429e2aa7d257cd4d80677f639f18078390ef6923bf90abd397cff6b421. 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/CHF032420685.