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 0x890f59760840f82eb9a378202d7c1f683fe89e4f0f5f6020b80dcad6adb70d00. 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/0a80c197-a3b4-4046-bd41-99a270b5c3bf.json and https://artists.proofprofile.net/proofs/artist/0a80c197-a3b4-4046-bd41-99a270b5c3bf.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 0x9ac767c5e4bdfb2d9732c30ef9353332f50085c939e4410edcb322979088df68. 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/QZDA81920749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede47f1d86d68362f048d1d95cc19fa9c78a509d1af18fb6fb0ad6fbeb739478. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZFYW1987111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe53ef2f68c70eac376eef824f62c180d646228dc09b5e3b6d5a2165704ac891. 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/QZFYY1918961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ec38c832f9407cbb7d2f89fbd3fd072fd9a821bdfe3becb8d4b08a932a8933. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ72040759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0cfb374c66f6c6f6739c88f1691b1b5cd12da34495e025cc9503f415415e18. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NLDP10800320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a805f909f71ebffd64f36dc4c97f752a56ac0aad410ee3e43e54dd72ca2c86a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZTAW2267413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1920d35ddc7daba9657774785d6ba76ac3e79a96ff2c88b3b5e2989195713757. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZTAW2467720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dab01a8578b36c88cf2a0bfe3ef8f85a3ee7d4d707bf5b4a0a55e5e918a478b. 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/QZNWZ2419412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56d755a314dac0b290fe71eb744bffdcead513bcd29726c4324263b7a440eb0. 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/QZHN81955026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e5384663db960d2611d0568d6cbe2e10a309e8a4f067d5f1db2b5fa42ac97ce. 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/QZWFN2371176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x067bb30e144d736d60ea03f2f53878320bbd7c1de35e7a36cabea5ae020ff8d0. 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/QZTB52304075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1fbfe7ebaba28bc05f1be7298e7c0ace293424d9f3d15938b6a478a19199df5. 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/QZNWX2405511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad102b4f216c7229ce54d52a5cb8c10e12af7dbea4b437e27b26e591ef4f2efd. 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/NL5MF2100659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39bc5155191760ccffbc0c876c0a463dd4fbcaaa1935b097f3ddc0e644cb558. 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/NLDP10800301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7912b302681c8cb506864c265af535eb3f94608f6d1b8b8799fdd9f1c9d0e7e6. 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/NLDP10800324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816ef746afdca519d6cc7fa407faf25a35b369149a3826d7fb8108c4353918c0. 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/QZFYZ2040577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed76253803c48c5d3412486dc024ecce8f3ab9cd32d2a98a2cee065ef9c0cac1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLDP10800293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb24a626a0de5ab9e48619c43c84ae338742dd61953946a39cb6be323a4fea11. 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/NL3GQ2100285.