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 0x45efb8e7b57338716f86792631854f836a4f6e0cbc3a918ad7fff4ebe35811e9. Chain 2 (Bitcoin): anchored in block 953895 (2026-06-16T05:46:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f16150a-06ca-41db-9c66-093384891c06.json and https://artists.proofprofile.net/proofs/artist/0f16150a-06ca-41db-9c66-093384891c06.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 0xfc2b23f49aaae052767e3f047b2442318999aacd515d4f78db123412960ce1b4. 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/QZTAS2400818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087cbdbd3714b4611bebe74b61a3f4c80605ffac73ad8c409067b1b123145e21. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTAS2400820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4638d1876885809125d9eb669fc40b557db18ea1a9a0e37ffc2f452e6431763. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZTAS2400823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb0264ae11329680c33765b467f410d218a4dd1f75c7f138c50371e3409e305. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZTAS2400824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f3445fbb8d5624f2edd10fcd82dfeb3d4d2fb35dfef65c644cdd46bba0bdb4. 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/QZTAS2400827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaf0012db9102f4f1a90ef6257d94520ce667b2e827025f92b0b6af5643bb5c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZTAS2400828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2af6de2dc04e9978da81cb969ea27581f3059bfa54a62d49b7b929badd751697. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZDA52022423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f19dc6c246c9194dd7f458c0c6394b6676c942702bc6b171eba35bbe24a0fd6. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZDA52022424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a028788bd37304c0cb34d03269353e373fc2e457d76087f14f78de9e20dae05. 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/QZDA52022425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ec4e9e6b29360dd852b247371e64aa7d1836012eaadac08a11a1cd946a933e. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZDA52022426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12f624750e374a49ce64403883356d0dd242eca50d59be71bfc3995f15f31daa. 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/QZDA52022427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7493bc98145e4a5fe3c337bcb6e0554b7e71ea40f7903749471befa5eae7f27a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZDA52022428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b73c4987a24ee42e4b791606935985c7c52ae10ba9ae5c68f0028e404063c1e. 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/QZDA52022429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd20747be9ff0fcba74e5816c17de34e4e9076fd60ac263ef181b5afb9810cfa6. 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/QZDA52022430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4044e99c427889e252c2a096089bb6193771ebac44cd4bc3e3ba206a1fe8fe7. 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/QZDA52022431.