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 0xa927fdb436e727d964ca1a32b33a3c8db33cafcabd82e6907935256ca29d9974. 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/0668f4dd-cd11-4eab-a596-984928f1e8f6.json and https://artists.proofprofile.net/proofs/artist/0668f4dd-cd11-4eab-a596-984928f1e8f6.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 0x2d5fab2ffa1bbdaad781e0ec64a7f1f760683354e87a803ed00afc6a95783238. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/HKG732429537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806ee7043a5918d6232914ad149cab4816b1a23eaa647a0431ce5d0e6b162089. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN62400497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b538a677a11eff87393a70f7c5b2885e1b10bb45d342cd59fdfa67ebcfef80. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN62491361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c161fee6268acd0bf9ac4727ec76d21ba1d81e0e3e8c50f173a9e1a6d62f8b4. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T11:28:12Z), 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/QZHN62491365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7e16d8d907441d67e5a2afb7af41ef887a68595f882453205eea155eccaeb2c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN62491366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb19bf96fc83d1f21be13bec4a0d1be834a27927efdeafb8ebf95aeb700c65d. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN62491367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f37d2925b0127f97e4cf780c9f05db942723b2af71c9c82daa41b7c18e2ea2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN62491368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d0217c56db9c456a8c5d48eee674bdbada63a50650d6ff0fe76ed240f60d18. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZHN62491370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2bd333ba272198636fe715b5a1fe303629ec79694319607049224f43dfbeb1. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZHN62491371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1425df38127ca201066c0773babe004b1465f981d64d157a5f5e68f186da6b0c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZHN62491372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf883e1b91d0a959f418ea0840969e498a11ac0be52135279a6bf2901802755. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZHN62491373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76766046e87c77408316aa8be0b3ad70e49b95602b6b8e7e3bb7f4766bccaeed. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZHN92467735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e473a2ac6645939091ab495f2a7d34f81afe57cf2c94439163aaf949f9ce044. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZK6L2455060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bbda2468544b604419e35b39094d55e1089acdf75527399ac3c8d13049fd9af. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZK6L2455063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07de4f25434e123766d1f873d1435fc298c28931ec5271b8eb64062e4e52388c. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T13:56:57Z), 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/QZK6L2455064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f09e140b41b6c17ba8913733342e33d696cf3507274a0d24627f19488a19cc3. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZRP42464508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77700fe3976eb164b65cdb88c0ac93c6dece14254d7ea460b847eed7941061f0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAT2446462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6bb60607189d0f205a3274b2d20568e8360f7f75c8bbe1b7804be5148334383. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:53:53Z), 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/QZTAW2444376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf06b9ac2d25eed55eff8dc01716098b47ea2bd6427aacd2304ab99405eb2c4db. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/HKG732466743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45cfcfe2af7fce1646dda3585f95ac0cd86fc64d736f447cafeeb55900a80514. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTBC2436019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb08c4db9631341782a74082828fa8148a40cf5bd395373a152d5000e1da10d1. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZWFP2477348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa907b67b44dce3c0c1ad343e57e3492432a9ca2cf6a98f0be42585156fc32ff1. 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/HKG732505157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be5f0538f14fdbe39fb626f7b3425bb645fa7352c7a466b41cf534c261650dc. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZFYY2515362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631c3eb104359bde0f09de1cf9ae6e8eafb02be7cf62e048ba7d2a76429d8e24. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/QZMEP2559124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1866d5cb5fc500c4c3ed624cfc2b236657ef8bd2fc6896731f961a2a89ae9f3e. 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/QZMEQ2555687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5e12069d142307ad4d954f2fdbd407982b600e92bbda2546904f8f9c502a82. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:46:38Z), 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/QZNWQ2557516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c73e90ef3cc71a219fee0d11290af38015635e4c027e55699344a9b24d8de8. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWX2567008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57398c4ebe747e8ed78126705a99f39b28f469060d192db875e581ccb409175. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/HKG732561204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2a42be7e1325eda8a049dc804629083e1b8da79865696d7f75d6f74905d1ed2. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFT2506353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4357c34ea33c0dac47648d9439d0885648dd26cc877e6d2057ae755c9abd0567. 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/HKG732562436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc53b73eb03b3de6121684f2a06b3b7021ce59f2ef6ba0e5715b34d538eb2936. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QT3F92500370.