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 0x8a3642f4165f0f9a4c072513a21d0c719b33e0def1acb6a87450e57b53e9a228. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0b5f344-08f8-496d-825b-d0bc6741dfbd.json and https://artists.proofprofile.net/proofs/artist/b0b5f344-08f8-496d-825b-d0bc6741dfbd.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 0x2a403cd6be49a77327d697648e15a1672c6f732a7e7d74159a87d8509df4e1a1. 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/QM6P42448719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c8f8539c09475856fd5bf33ebde6a8fb4f21cf7d803e47423f3d8b7125d1ede. 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/QMDA72326472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd89efe0d8cb1f59527cc3d5b6385d2fffb669fae8daf088c96440209a49287d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QM7282342514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ffaeccba30a6b8cd86f3b70ed229c44e85be1163bf1584434ef41bcbef841d0. 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/QM6N22301071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5975f3e02dd57fe19259ffe8626b0dd8a665a5fe2c2a93159b7d2569e721ff6. 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/QM4TW2358445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4d7e16ab25d066be8b3ef8c5a6719bba568656137d6899d9b2a52d85769be8. 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/NL4NL2219854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f456b1870d9e088b9408189acf6763a6ed6682643f11636175af2fb27b263f. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBKPL2283261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6138f8dcd925a3f602c428f070c1a29a5ee97d725fcbee9a9a2f5c5da1adec80. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBKPL2167261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e95e06395b3eb5f018009692797551f633f623f812e88e789c2cae3208ac2d. 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/GBKPL2148537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf591a9edd01d3990301ad3513b4b805d963ef0fcbd7c12425d18e06dfe1d33. 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/GBKPL2026046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd59f09f8612ccdd3bcc180db2720a4e0d9cbe18cba6ce669c3c06b3d3650934e. 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/GBKPL2082590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8489a5b2eb26b49dd1efe85a32aae155c2fd3c3b53eda2f04cc7f261dee72760. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAEM1944895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb518743afec47c0ca0f7a0827fb3fe38076431a621dc829117d7244956e81f62. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GB8X82317272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75d2bf61d21dfb4c698b79637d1534f8f7590d187d0a2f449ff6073f444f725. 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/GB8X82317364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bb641ca0a33636a64af25dd4c2c3de5a2b8db9ba30ac46ba35f3056eabf042. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/GB8X82317301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9645f2f52fd1e6fb70968df6f36864f584ee8dfe7601ad32165a1dc0cd9f62e. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GB8X82317286.