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 0x10e1ea911f07fcc24b81d10a7f5c794f6c5fc77a71b1ab6c756b05f48833f708. 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/de1b2b82-8810-45c8-9bd9-b838dfcb0b16.json and https://artists.proofprofile.net/proofs/artist/de1b2b82-8810-45c8-9bd9-b838dfcb0b16.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 0x17620ebce9151e69f1c5d57f4e5dae5ac5fdec3ac3afa7406cc2e9d8c0d7993e. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GB7ZY1100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816506c97436db6433c90e537528a70b02a4c0729a12c4287b5436922652ed84. 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/NLCK41035415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10de24c56e004aeffc28808280b44b2145961134652db3533c5aef4768df5225. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/UK6821406448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da5d6674485456e528e96f2865d574b84c07115bd6b8d294e8abea9aaf31104. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/UK6821406449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c2ffb1c113d58dba9a1416c737a59b1a0fe8fe266598094bb0110cc2bd03ff. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/NLCK41045479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446386e6b60ad1c017eb0c2de154169d03e2e77e81365d382f48ebf04f437479. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/NLCK41045480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bb71edabc5658a0d4eefd34d14cc9dcac758aba5124baa32df1036cbbf87394. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/NLCK41045481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8a3e72716b3c20f1856c13636df32f8e69f9f195de3d2527c40276e64e106e. 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/NLCK41045482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeaf23d4d6b07cd64002a6e9c2c3d6139179e1673c7a10d12676c39ff3df1e30. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/NLCK41045483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9dd346b4e011d9f5955fd1e2f62c712e3a0cab317001f519c50f699219a274f. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/NLCK41045484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bad0bf166719ab5fed66a4742574e37a96c96cf57998ac135d0c6db3b8e21a9. 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/NLCK41045485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bda6489816c7df70ca6643f8d3c00dc59bd939d64f60c9d0f9001fff5856648. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/NLCK41045486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd894a7c67903086f3e514d21eda680633d883fdcf44dbbf2ee7ced34e796c37d. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/NLCK41045487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937dd589a26890fe9351c52567db58f8acaf58a66b72df5295a1044bbad2257c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NLCK41045488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f3bb6165b580159054d160457f392662f36511d3873e88955f6ae99a1f4033. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/UKTAK1900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1fa54853dc68b9c1a69232ec2cfefb5f61e21591c04dd09c2442440e90612dd. 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/CH6541688317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb943789f74d2d0d9614bedd7486becc8f961340a77217057f55c05f119f61a. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/CH6541688321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b70964e9836b8a9944349f599e18c32c26dc4ae7d9162758977db186510c394. 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/CH6541688322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5871b046676b06dcd42edb18801d70c050b83a2b4a1dc2ad06d28af2031c256b. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/CH6541688323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6ef0553aa2a6c8a3b6a43518cc25fcd823c7b2f896a66ba0361ac89f1d8204. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/CH6541688325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277f5069245978b6f6b702e8a1095ba021c8d00fd6f115b53628f6aab880d444. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/CH6541688327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c40cfd09718e3ca36401eae5d2bc2471c12db962884fbd5f67d19617f691a2d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/CH6541688328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11d7f25c211d2c22690bb838b195ea74eea390367384d787159382c897ce44a3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH6541688329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9daaea95e308536908c84f313764dc8debf9489fab31a4d091291c7739e6cf. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/CH6542365780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe299f05bfb41d0d5a4c1bfed6d917a1dbfe76899076731aa5aa41a2d8851653. 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/DEH742417610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b337ec4b380f2cc019a4ca9d38a6051901848c1dff49176305f853bc13798d. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/DEH742417611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4904244ccf433cd79369f4f82f474ded2aa1061c55b137d9fed1f1e8c9edf4. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/DEH742417614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ca7ee714d47f6ba9aec6a7f771e9ed4ef2bdef8973d78451c6561731e521ee. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/NLCK42513968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e30f6b9685432e4aba2e26400985e0192ff542ca85f30d1ae3d64363e0adf40. 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/NLCK41043952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75eb48f51d108ac72c5ee7ffe04f1a588817bc30ed4f73e11f061cebeca0f997. 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/DEH742033158.