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 0xa9089bf62cabe57c2d811cce3fc04b4347090daa9b079eba757d9b78ec5c73af. 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/57b6233e-11d9-4a07-a430-5e96059dd8ea.json and https://artists.proofprofile.net/proofs/artist/57b6233e-11d9-4a07-a430-5e96059dd8ea.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 0x969620d8f2f682b5c1c3bd50b45c99ea58dfdbf3e7481a19be67dbb78910b1ef. 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/PLUM72200075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14dc125a9c96518141683b35f4b1e67e5df21b31141cdef7714ab7e46fef7bc8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLB382000252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f812cb487f701a1e9f39a90521f898681b933a98c5a94c5973b6f3c48af0a51. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/PLUM72100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92211f5e2e845d792af69539339ba3cb286c64b6c2a93172f2981b1ee7b9d5f9. 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/PLUM72000584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db5a3b898ce7233a98090a815e48e01660128350d05c9a915bfd2735ae6fa13. 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/PLUM72100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdab9395ca23db79c30d50aa6d462f79e3fb748d105e3d9c8f217a3bd160abbb7. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/PLUM72100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28297631e2cf95865b18ef3bd08b67dd0ac7bc583ec100aba9fe601ecbcff4f. 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/PLUM72100082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5725711133e1c8728115b3f3d2b7b916f788e12cb88c139b166dade33451356. 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/PLUM72100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec48a6544b2ff3be92ec76d9022c3188299abd3690d4dbb3babfe2670041270b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PLC061807434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5b0fe5346000d6357f1f59cdd3dba3bb8406279ffc1252aad85118a858bcc2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/PLC062009052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe675ee903a4d52abd6ba51f805fe1b00d0521badc8ec92472115dfb5e6e03343. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PL2DY2400732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8138f59572b99bc23c646a5393d4ff1bb6475f0d8c4e7157e86feac85823f8. 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/PL2DY2200135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf770f43ae23e577ed4328dce45cfba7ddda67a4982e6536b3de8c5603404d4ad. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLUM72100807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a733e7d81f1ddeb72a95a482bbe2ef6bb08fbb6d5dc22d3a1f32ed7e927aa10. 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/PLUM72100410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f812cb487f701a1e9f39a90521f898681b933a98c5a94c5973b6f3c48af0a51. 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/PLUM72100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28297631e2cf95865b18ef3bd08b67dd0ac7bc583ec100aba9fe601ecbcff4f. 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/PLUM72100082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db5a3b898ce7233a98090a815e48e01660128350d05c9a915bfd2735ae6fa13. 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/PLUM72100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92211f5e2e845d792af69539339ba3cb286c64b6c2a93172f2981b1ee7b9d5f9. 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/PLUM72000584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a68607dcda216dbb34c892e1013e65f458f63f7084647e16724e9ab05b8937. 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/QZFZ42019089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec48a6544b2ff3be92ec76d9022c3188299abd3690d4dbb3babfe2670041270b. 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/PLC061807434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176e0b52a030483d95e03e1a550be599ade9cf1beefb6ddd5e5347e9544540f0. 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/PL22G2100008.