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 0x4bf882511058c706ee01b11fc94e8cfc950f8656047757272005f4063378a000. 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/e0e73eda-b856-43a9-8b93-eb9e00169573.json and https://artists.proofprofile.net/proofs/artist/e0e73eda-b856-43a9-8b93-eb9e00169573.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 0x0b0ee4969432329e726a92f3f99740b85668919f566b44788775a693a751e161. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/QZTB42280944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf609dfe00b3027b21a2366971b9ec2c2abae991b0abd1fc15536327971c3c9df. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:33:17Z), 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/QZTB92249986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a1d33726aa3ec819d57b36064099584fb6ea77e29749d1497106aa40397ba2. 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/QZTB92249987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf22928c28c4eb09fef8768dc99b36a891658d158ce085e3affc03670159a7e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB82219018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d61c99c47a895f3aa0ecfb3e3a7ee7945ad9a55b44d04cd2059bba31428f5b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:30:22Z), 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/QZDA62358680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafedce2e1b34b482866dbaf259dcfa49263b9975bf7dffa6e9011a2239291989. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZDA62358681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7adda74e68b844b2e53a8ac6ce97324f588cb362c7c7765ec5ee2c042193588. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA62358682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefda639fe372476572186d86768939b2d2768b9269681693ee0281300168d08. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:00:51Z), 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/QZDA62358686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8319fa7587ed8d8b5c1d54c1c9193bb1b916d7af680cd1cd0ff8f791d95de86. 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/QZTAU2326760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81bcbc3c750fd2db500962b10d8732ea8707b0f7f639a3fc77022991db4e9c5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB42304936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11093ca31dea6681012c86d7887fec4c26143181d39a48a581433fe6591df051. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZTB42304939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6228ea0e1bb07891aca6709831f198526144a0c1de8d1be002174f6213d1e9. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZWFG2485985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fcbfcde1e6a9f181f38f3668372a6176fdeda730c54404c54c74a45109e3b6. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFG2485987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83afacce21eae634dfacc642bcb03d66ac74a482428fafaaa81831b8640ea9a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZZ7U2472401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c8cbb1f2a4e2e7b6697765de883b61e12c2a849e45efa1af6843dc11cfa839. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZES82568582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185076d0240d32a4364480a045ed4107418a7116b60d1710ff500ab20a241bca. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:50:44Z), 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/QZNWS2500924.