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 0x765856f0901874b282a39777cec9d23a32f12e3f0cd1fa06a25a5e3600ab8c6f. 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/08c5335e-be06-4d37-911e-6422bea3fb48.json and https://artists.proofprofile.net/proofs/artist/08c5335e-be06-4d37-911e-6422bea3fb48.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 0x603f1885ce0b6a239f92159cbba3591aa7bf0bd492de6127516448a69b535549. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/US6R21427393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2004fc1368622ae66d6aceb3ff1b9d94a95017a2f446e8116b69e2a9c9212eb6. 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/US6R21427394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb911ea95d51230a618ef3d33f4da53435e28d08b95798c6f23410b3fd43b23b. 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/US6R21427395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x231c6958cd3bc89a04439722e9c1c4fbf140714199d1db0004393a9c41900b42. 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/US6R21427396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd63bcdad5cb82a5e63ebb4f55504d9ac0f4bfb977f82dc35dc8d6e09122ab4. 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/US6R21427397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7128a70cf94b3345ed8c1f5519f504cbeeac9ba7f38d33ce026a36d16cc22e5f. 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/US6R21427398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa607b90df62736ce0f7611db36e189a421176bd3094f2cd9d6c4fd8416a3bf04. 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/US6R21427399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0114cc72dd0ccec139718fa1fa955c1693bb14d16e8ab355299658e81bb8cd6f. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/US6R21427400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354953f4d98e6e16361c896e690b765321242215f607c6b8fd5eb3032b0a118d. 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/US6R21427401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd6d56d11f1e4521ed9499452482b6e478edf565f97a7ed46f152ac83d5d298. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/US6R21427403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc338c51841288eceb819a9ceba3f5c8a49c4c4a95432515a4f82f5815d505919. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/US6R21427404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842bda74c1196c076db283f2639e1a0904288c5f16fe01a839fe49df7cda26ca. 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/US6R21427405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ac4c47211f63e8495ac7ed4c4f23f4e9e28ea946d721ea0490ecdfa7f54563. 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/US6R21427406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e307d304c7a4e862489ba9f3417465788b2940a1a8c1f307eb17f60833c6c77. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/US6R21427407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac785b424429e934e88f954d9e06eed4abe2bf63616b24f9454ca219bedc3a5. 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/US6R21427408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45df8c46ec4c85336cfaa46fa9e0c8ebf1df802133fde8ec8d8ee237e4ebacb6. 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/US6R21427409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722dd6779667e759ad2ef70e77426ab9f84930bad15a48dbebf0adc076c4d6cb. 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/US6R21427410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a9acec5832d62a599a17d209bfa89f6e32a7d726f9d2c73dae19de2dfe256d. 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/US6R21427411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd877cc9fe4d78a6fdf595b02a5f0bcd3f5e998578e897cf6666b5f646b82be. 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/US6R21427412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd151524858a4773e0dd036955ed1490881322fbc9803acd4035c3ebb3ec2c1d5. 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/US6R21427413.