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 0x11301a5567303a2600db9d443446cb4aa2958de65e667c4128457a85985be073. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d338e4f1-e7df-4187-8dd3-60657fe566fb.json and https://artists.proofprofile.net/proofs/artist/d338e4f1-e7df-4187-8dd3-60657fe566fb.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 0x595d18d9b43b9d73eabf3b33edc984e09b4f7acea397c7531d8b122c069e6a91. 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/QZTAT2336961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d98204b5b0bbc1a7978095f1185999b3007c333e0cf66ef8459fc2d98a3ae5. 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/QZTAT2336962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44e805951af5627ecd2d3cfff33d1e9eca8e5892594b7ae5aeb8d997bcddfe1b. 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/QZTAT2336963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b7c5feb6cb699a410fc79826a40786f8ecfe5253edf16823039897c5341b35. 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/QZTAT2336964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc22097ca9c90c8510c294919cbfa97fed2e1ef0a41c6f5240e4b326aac03e2f. 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/QZTAT2336965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dceb104d383ec4b849b885c42f8af24adb0d7ed2bf0db3ebff7909892d8f670. 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/QZTAT2336966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cc7e214b65bd7f4dbe798eb3bb4da998c39fa8f89496dbf0bf1d88be5fcae1. 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/QZTAT2336967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05351d6ca87e6f59c3df94b55c1c90dcfe342248650d619e3d202726732a4b0f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NLRD52265688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d21b263a5cbe2a8b70c1a878c18d1d7dfb0b2049f50457d81e3f11ddb2ffa0d. 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/TCAHJ2315127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e6e9d16195868fafca72fe723d1d65a2947b436433d901a6f0245bf74bb9b8c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/TCAHA2368851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5398080b9a45bcb38cfc6666d8501851654dce3c422bd59b500c66721e2e2529. 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/TCAGP2271436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe818a9b6a9acfac34b5ce5e5a1f1ed4f41f4fa1196629355b62e5746728c731c. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/TCAGH2243688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb7974c6d0e5c60c5ca887b849c2449cce46270da7ad919c97b221bea93fbd9. 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/QZHNB2288656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c17532981f58800ce8d482fc3b571667559fabedf19de5da8e4dcf4df8004f9. 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/FR2X42175274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1e158ff90953cbeb07d2fbbdc1ddf1d34d699580538d9cd1352897e3362f33. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCAHS2381699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dd04aade1c6bcd096949557906834efc9e446b8297ae1f8c2c1e703e72d346. 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/INM6V2250001.