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 0x55b52391f4cd76be13eb372711f73d06645cf99e7739fc7a496f2d60051609cc. 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/0bb0bf64-9ee4-4512-a340-1525b5a1328e.json and https://artists.proofprofile.net/proofs/artist/0bb0bf64-9ee4-4512-a340-1525b5a1328e.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 0xf4d0e1f41a17b89cddd0338824c4b8e2508d2d8c147b60ffd0268e1cf264336f. 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/GBKQU2353247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ad3989e18ab6806ec3ddef93fd3bdee74d78f5f0f9f4c30fc417c8f61304ac. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:37:43Z), 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/GBKQU2204652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787eaa4fc9dd10b4b346c619576cbc0d0c06b137abd5ac936f735ba755c6b16b. 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/QZGWX2221229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2ec5d97ba9da21a6f1addf30466181a082305d5494264e2c54380273921bbcd. 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/GX4R52387753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b19485fa0bc8be6771a29ecc756453be9897138bac9620ffbf065ef4dea352. 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/GX8KD2278054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61fbd2dfe7d3ec5987cdbe0d1b82479d870f3b63483e19597812c61223272e7c. 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/GX89G2459140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd739f42e277f2892e33c19ba7347df21432b10effe3cdd1de82310f3bb8e126d. 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/GX89G2458662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b35286b8ee0a232955151df66dd55ad5edd11b64cfe9f6db061c8bf6bef424. 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/QM42K2380151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd904d98b7964f64c2d41b5f052c15d340f247f90a582ecc2993baebd2a4a3d84. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZS632343449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2694650f819b1a352ba582e105e3a0f06bc8144becece241599ff11b793c73a3. 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/QZMHL2357493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe870b5d2ad09afba47e185aecaa4e6ee6b6cf2284db8a771de2f0b977d365819. 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/QZMHK2370052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x008ebd469e65277b01ee9c6644507261586ceae7f3d680c402bbeccb317d11da. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZMHM2352481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61735664912197b5eb4c230f02057f5759a622157ce74acff472aadf83b13e4e. 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/GBKQU2396031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ad379dda81ca7d207cd036bb3a33be46370ad026f83e54d6eac5db84f7b969c. 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/USANG2454772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe896d703df3220206ec89d041c625876c55e09e9ae7a2f96f795a409c7cbb2b9. 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/USANG2454773.