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 0x420b1936c6e674c5c95de83cee9ed988be400b2453eea554d823588419b9fa13. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d789902a-d5bc-46a9-a493-4dc3dc3340bb.json and https://artists.proofprofile.net/proofs/artist/d789902a-d5bc-46a9-a493-4dc3dc3340bb.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 0x72ade6778b7333c28fceeb37e489b042226c3b8b98da04b471965001cf86fde0. 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/QZNJY2326909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x480b9accd2fa05639de727b0a710375196938b778d9436a744d26201a959d366. 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/BCE7P2400143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed189b92c09ea6df04c2320f16668b8d05c0eb2eabfca819c6dbc73a40af2134. 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/BCE7P2400148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe968aa0b63a5f650e0d4b86446fe83e828675f2e0188da57e710667297156b5b. 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/BCE7P2302498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9108e8c3eb3d48e81364a5ce2c8ae33c0884bf08d2786c7e216c3d7d646cffdc. 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/BCE7P2302822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5191abf00004601b665cafcca80f710bf58b505ef63147406935e23ab452ab63. 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/BCE7P2302819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d0dd7949526e239f692326d003e63ba34740a1401608702cba26d525252606. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/BX4IU2361658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ce3c164b7a7ee5de41524fb027ce993e325fe49d70296d6d878d567d78fe83. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BCE7P2301896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6442d7d250ebf1263491ae96a2662a2f8382a5a47c9ac156774ba4ff22b99996. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BCE7P2302616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671d038667f333d297b3f24dc90000d28129b1d16f0004d037f0a8df6a0f69d1. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/BCE7P2301895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb31cd1f01e87a8f49b44e0a6ae8cc864f7d5b913dbe4ee47231018e207aad63d. 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/BCE7P2302495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e15e0069747492dfdbce38572b9d1142a6c2a79dcbc81ed87364e4b1ac2fc3. 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/QZW9K2457660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30c8319cbcb4f5daa564d0c60814903c64ccecad0161fbe2c90f6bb8b9a2ea9. 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/BCE7P2302602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c9c5db9f5df46e877f712f186b0fd42cd08b2f9b656017c7fd27e6c54f6e2e3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BCE7P2302818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd2f44ac183982921b6e58f7ef01de233ae8bce94fbb1daf2e0d84a79e446ea. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZGLM2370284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f5ea8d8717eeecb36c72b29f3926f8b4dc9066515afcfcd72e772300552ebf. 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/BCE7P2301788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e8468964a48dd2b00b3729e5d1b799dc7824c9802e5d3c139774fdb06e9b3de. 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/QZNJX2394778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19803546eb4f760005adfbfb488bf2bdf5b61271c2bbbdf890eeb3888d8800d0. 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/BX4IU2342779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84b0958cf8b59e39543409901850f9acefd2e86aa5985e6ec9940e5cc93e966. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZW9K2447315.