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 0x6c29efeb6e28ce325fa68e6081186f1f4bcc5cdee1aff9c8341667b7ea52124b. 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/9eb91421-3b3d-4d14-9673-924cbb5a1745.json and https://artists.proofprofile.net/proofs/artist/9eb91421-3b3d-4d14-9673-924cbb5a1745.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 0x5a7ceac689623791844739c0ee7ba7e82504c81455365d5e233434334cc4f5ac. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/IL1012000463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29bda8dc996539a95fd906b658c88ce0be36fcd53ceccecbbba11fdcc451c8a. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/IL1012001017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc55f55a21cff6b859c1ccf7458ca2a208f2f9091818c88cddf3ca8c53fd263. 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/IL1012100254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221d1ecb23e7ec6ee0eab28bced7affd03630bcbc742f6b8f3208af9840012fe. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/IL1012200548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1e6a975965b2667326722f40779c4c521fe16d52e5a48210ba845c21739638. 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/IL6432200731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41ceb04ac4cd7b249bea42bb1dbb111ebd6b4a24234fa5c4bbf1c008f897a263. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/IL1012001155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85e00823c4b6e5d8be0182b8370cd7d42bf4b6fe1e63633c972f8fb3ef139950. 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/IL4721000761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad69031e51edac2b4a3a6a8457c2869b014636f5f071a4f4652432dd90342fa3. 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/IL4721000762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c42b0f6376511f43765f9163bcac7900b9cd32f1a058e22ed5b8242ed54c0b. 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/IL4721000763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49eae862ac9624c411205db463cecdbf3a5373740948762be427ba1a59aae313. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/IL4721000764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f26245bde3e7254254997203e2b29fbe88a0b5f7a387ac1114cdaaa39762863. 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/IL4721000765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e177e436048b64a15e557d2089b30aedc18c3f54a80389b29fa7dedcc816295. 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/IL4721000766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05323a8628dd23b63bd0c6869b125b88c879a6b71950f8a1ea07c0c8713500b3. 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/IL4721000767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4060f22506b83a6cbc678548809d301104428aa60b349fdd71622d47944e2a95. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/IL4721000768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbef01e7b69d923e0a07a4a7a00b70c670e4240af5eeee26eb50b865319cab83. 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/IL4721000769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4eea05d26e91368fb0a92a0d26328c31c7a1e16754d94b35c3203b413d5c335. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/IL4721000770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1e6a975965b2667326722f40779c4c521fe16d52e5a48210ba845c21739638. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/IL6432200731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdba14b33f3884065654b00afe8a87772d5f6b982c720cd027f3d060ce4fa9e94. 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/IL6432200734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6f4291531babec6276205df6b503bbf63697e7b0f8742450a44949652bb0b7. 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/IL1011126234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0087d2a6f1e30efd14e6b7108da9673a43eadfd00fa124681af4b5fc70119c91. 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/IL5821501827.