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 0x2d762306cce82bc756f7489b55426a4286f7e0b5e44a39a57dc4d7d4d96ef840. 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/dcf1dddc-eb30-4270-bf26-715d8840a2f6.json and https://artists.proofprofile.net/proofs/artist/dcf1dddc-eb30-4270-bf26-715d8840a2f6.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 0x831bc29656196a8ead7d8265ff9cc668a0343cdb8e65374263ec5c2f4ed1816d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNMX2407979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c65ac58d5fb6f898c9ec7885b9d1d2f67222f3965411977e688f6d8704887d. 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/QM6P42451518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7b4025654d5cfaf923c6ec2bc2fe7c6d5242b8e57a5a0db5b13d23573b1c4c. 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/QM4TW2444731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcd2a73730350d5e77bc5c118d33acd91b939459e9e6673c3f531a5f7b28b46. 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/QM4TW2444462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75f1ee8b7a942e3ccd856a182c2311e4fef7d9453e024a3b254d577654888e0. 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/QM6P42311133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc790412cc4eecb7a4c67c17837dfa545b968d60340feb57af4444e5ef39cad. 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/QM4TX2344794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc689be36092df7be61f8b3669e4864e383737a133d861f2f08da10cb644929ed. 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/GBKPL2212254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885e05b1f3cab85211d09079ae8e96f6abf764bae64bbffffa128535dafd165f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBKPL2211405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5346c47835d3ae593b11574ce3005001bba95fa0e902a49acae16f2b30adafe. 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/GBKPL2212253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4423cd1e44433184ceb38029413e90e78233d5ccd2f14720ab177d1507e061. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/SE59D2159801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc7083bef6db90bc2834b830bb5ca8d4c66f32f7150fee5fbfff7083500fee2. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/SE59D2130501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe13ceebeb6a6512c9f2f50d029450efc359fbb5fb2fe36d302daeaae1a4e7c. 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/USL4R2091248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5db773b241ef3310429acd3d22bbd0bb5a0a50e588bad39ce5e642f2f399c5. 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/USL4R2091249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6afd2ea52bdaefcb5532179f9d9a7588814e6ca89d11e7c27032ec1f35ed04. 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/SE3SA2500301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbd4c39ee6aaffabbc0380e56f1d062a3828787b79686fbf1e837a2f1c3160c. 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/QZHN52208956.