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 0x6b5ccc4f01f3ba002b052fd57b457a514a38d8074bc973349870c55d9361d5a9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/513dc337-a2ce-4eb0-a6ff-b46fe4581811.json and https://artists.proofprofile.net/proofs/artist/513dc337-a2ce-4eb0-a6ff-b46fe4581811.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 0x7197e09c2ea4d8a93ffd8f0d25dda32b3210fe09c6eb25218df127a9f068d1c0. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWR2517418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552e48543b0f8e2e54382f8188082fcb42d69864a371adbedbb9570c8169f24c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWR2517419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30bbf0c3cc3fda197bcb517839da2e78f9d00817f760f8779796f29336c2073. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/QZNWR2517420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0e38184cc5ac20543a3dadde683ef30e4718c7a810d1a0f893a109f12e1a7fd. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWR2517421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c79c6e81941441697e5961bec592876d98ca98ecfad35eec211bc71ca6f6755. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZNWR2517422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc734fab009920e85e3d4ed706b5e9f1010438f29f475973a5ac84839d89831a8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWR2517423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d39b7348fcb9169cf20687818390cc30aa20b6029da904e21fa5ca536ad3fd. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZNWR2517424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5c3c99aeef24f33619602b69c77b8e0be4616c7513266425af44ffd7ff1817. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZNWR2517425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e2ae78911493870874362b5c50e5a5be1c6f47f6e68beb875353708661fbb47. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QZWFQ2585828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5a624b30241cd326c5ec452636c60417d6d2ec2a8fc689fb10d5714c1f51ed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFQ2585829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a9e59a2237a4f163b1823af53c5f930f02fd9e71af9e6c6d7885cb04bf920f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZWFQ2585830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82bd44c2b621a92616e1b5dc8e51301b6f4b5cb10fd04bc1e6231df3b6ef633a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFQ2585831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ea9ee219285bbfcd47cb7d4d405fe40b86f8b085fbdd7d48eae0bfcdf0dc53. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZWFQ2585832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af99d8ae9a26f6a4cb235f7ab6f63aa9c24e6682cfde9207ef8c82dfa35d2ec. 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/QZWFQ2585833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd48ddb2115bbb625bc684285e0cafad526e64d26cb2816e4032b49a89ab74a. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZWFQ2585834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98e00ac39f8eb4448e01e7cdfd8223597525a88bfcb04d95ed5d4ca856f26e1. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QZWFQ2585835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a5c762970fd8e0712114ce93356fcdf9b4affd8f391928bd8f950b982bf62d9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFQ2585836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b42db23c9ebf4f145494d1ddcc0c6c82bf64e4c0cd20d228befeddd48bbc1e. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QZWFQ2585837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd237b3fcf15cc50bba81281e602b899677cc309f48cab498afeb8e81649b48c0. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZWFQ2585838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fce5faf7267595327438da16592fdd1787477d488546eee1ff2c6ee123b1db8. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFQ2585839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9660b380d036cc1f9ce4b3a29e3c81f97fd71d1d30412bf16ed4a7c9f44d0758. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/QZWFQ2585840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab8b519c8d0c38951f8ed28f7b092539aebb42c9d90b41795a8da8f5ea5b939. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZWFQ2585841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7846401a03d7b2eefa21dbb9197240df8f22dc74fe26038c98c6560368a0b7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZWFQ2585842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104902acaec6ecd7847db13feb4abb94bbfb0d2ecdf9c08d41089605bc895bd1. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZWFQ2585843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552781bf17fe313e09a7aa1ca1b8d920b4d6f48d4338ab42c4d65edbb1dc5fda. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFQ2585844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ad943a311c137bc43a027da48d74ba14cfac6ec5a5c7f808d65e1550b24ef0a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFQ2585845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62bda5e83c4c28be5dbac789b28accc0ca25169e9dd25baecc6147f87ac19e9c. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZWFQ2585846.