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 0x8ce7b51ba51278499d092964c7681328b1ba6ed1bcbcb4703ab52a73185bb408. 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/30a13f7b-1523-4059-94eb-546cd19d5889.json and https://artists.proofprofile.net/proofs/artist/30a13f7b-1523-4059-94eb-546cd19d5889.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 0xda68a42aed4dbb986995b178673e5ed9ce1357cb45ba9f88268f7015aeae1f2d. 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/UYM122400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5d883a8ea2e12d31ab37f9cbb434ad13369166a3a84edf0d0089bb196d1db3. 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/QMFMG2375849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bee3a9874ca53e1c1aa8f8c532e3b1df7c12058086733cca891a701aeaa6c18. 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/QMFMG2317816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc87a72ed7c4fed6d284589c4ef817a25d646d0386f397f9a125b437d06c1edfe. 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/QM4TW2398442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30130ce281526f28acbab1ece9466357ac885360816f43eda85b00a71c4460bb. 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/QM4TW2327737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492843c91c04ae017ca8626361f96a34f16da3a3e9352855cfcc3d5776da8beb. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QMDA62251494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x454d584c24d0b20e663dc3c94f93bc402ea0b18af73d65475b24b829207d340c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QMBZ92286955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fdc2e58ce7cb53d1694f99364b1453a95b4a28c70d76e7ae1e313247e72e496. 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/USL4R2149013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd55d881b3ec80cbe3479162fe66508ee7748108098165b3fa5a74eb05a30f6. 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/ES71G2321821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fff90f8c828f90e1701a5b91888e142f5244cfcd1f4bd5e78fa0a52792df474. 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/ES71G2338075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e46c067d36aed00d4a400ecd70b8cfb415b8bdb13eb71e291b24913a56b15b. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES71G2338074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6d4bd5af028e6bfcf04944871b41cf6f76f62fbcc4d64b26094174cc132161. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ES71G2325345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc3528ed794de6be0d72c2638e14a525f59efb449177dc9f353fb8880325358. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ES71G2338076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d845afb18096d435ca39c4cbf8c9b34ae008adc5a8d8eeba0a804e1b1c33a9. 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/ES71G2338082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x406d94df2c4b6d1c4f5a9741cc03720f9dcaac2fc64e0edf159af963abea4926. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ES71G2338079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff726a198d1829e5bf739eb576d4fd1b8b53fa3852c1d6d6c5aa9b59397c3342. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ES71G2328467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b98d23a96e1ddd4f94453e4b9caef37a30a0599f9fef993bb3b99a8e56403a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ES71G2338078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc10d45550996c9d904cf4375e7904ba80e2efb23706aac5891c534299beb3a85. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/ES71G2334912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68eb1a721889f6e596407658f4b07752b3e58741170ae5e22d4259ac730a3f5. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES71G2338077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2254204f6631e3bf360359ecf6723b859cf0b29a41d37ddfe5607d96206e79a3. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ES71G2338085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9380117ae7226fed5ac0f6991174b455773ab0cc538f1f3bfd1d3e3430ee68a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ES71G2338084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6d4bd5af028e6bfcf04944871b41cf6f76f62fbcc4d64b26094174cc132161. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ES71G2325345.