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 0x79f9c034bfd7fabf1722a1f1db5c0677867eb36eeeb290b68d3bf123300a8c3e. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9ebbe3d-1ebb-485d-812d-c6cb4abcd6c9.json and https://artists.proofprofile.net/proofs/artist/a9ebbe3d-1ebb-485d-812d-c6cb4abcd6c9.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 0x64ab7c326206adc0fa7e8c0f6e8db666a746a32eb603eb46b50530012297afa6. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/TCAIT2466631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1831f122a0ac615e555cfc185c6daf578bf26c067c9f5063ed7635f5313ddf. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCAIX2469900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8b9284240ba3fb112396cb9d7b386ba86b43af4dc68a74a1fac9cb8ade1411. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/TCAIY2459691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a31e51fc85c279da00129ec09d94101ce1aac7eea80adc3db8b35ec82e644b. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCAIY2459783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3bed2f1a10dc2021a6235e01fe3844412b1283ffd7675ce0c713881342edd1. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/TCAIY2459926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeec01ac22a6b1fa2d606fabb4545bab4e4149bed89dab56fc5366fc5e824f65. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TCAIY2459874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf3c20a8aa31f10cfcfdd41c2f5fcbd6c90b7d18148c1ad0313e933210323de. 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/TCAJF2579907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556a36374bb66fd79cf47d369131402f6549aedb0c3856e2d355a33cbd4c0be3. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAJF2579916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1494ff18eaab5ff5467fd86856c893537af393f597c3e79c5fd6b508834de67a. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAJF2579940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3a5dc8c4ea742d593a8bde8edda54ea9c36b34ba60b4f0edc1084d8170affe. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAJF2579947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14289c1a9f5498b6124ed48d843e45f67eb9822116d815973f1d9b5d048d1e6. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/TCAJF2579990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3e4f0537f32040f9d36e38ac49b2a91b398e0ed89f591132b89cb263de91e05. Chain 2 (Bitcoin): anchored in block 958510 (2026-07-18T06:38:22Z), 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/TCAJF2580009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ab9b134306eee3df9fd1edbf9eb66768f2a95a9a0c36d878fd6358c25c2f7e. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCAJF2580029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b48f28074f136381fd6923740de0697a43e3ee20c0188c671b377ecfffcdc7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCAJF2580051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb184151e46fffc70a067d4ea11ffd384c32fd0993830c0b9285a87740494c4ed. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/TCAJF2580067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f6d2144326418c4d2b3466f27e00efd001b702f283e44c0f02597f5478eb68. 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/TCAJF2580085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7cd1168d44d3e0d4885d16f2df6b93a44893104821c6dd7311305b24b24955. 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/TCAJF2580105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473971525f52d47f8ea9e4fbf664778ad09a1ca819fa11ce36f3648d0a6b6d49. 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/TCAJF2580117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5113d756c57e27258e612ac56a9b289a69c1ef1acc08f2e2d41f58ca4380f8c4. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/TCAJF2580216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15a8c3591a577a00c86a42dbbd8e9d5335dab6acd5050e1683864fbd82bceef. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAJF2583714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca06b82feff7abdec30e37a046260c614fda050ce345d6d75df86ae0485f830. 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/TCAJK2587619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9f47837e1e03cf2d2d6c7f99f0e3318dab362ed05153e01abfda73ae0b0945. 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/TCAJW2589048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcd60cfee309fc7dad7d536d9e73da903cc2d904b5326dbe7f46f75a23b0ff30. 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/TCAJW2589089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097cb537db2a872fdaaa71f6cdc2b154e7ba30c0be2d743405854d87a0745bf2. 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/TCAJW2589095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2511d1898a83847b9a2ac53fe1de1fb83dd958aea7083e9bca17a7a5723038c3. 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/TCAJZ2521840.