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 0x40be4bc237fa187074b8e2229955e852e37afc73f0f8885c72c0479a203591c6. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dfd97035-e15d-4d53-ab6a-d0eeb3e681a2.json and https://artists.proofprofile.net/proofs/artist/dfd97035-e15d-4d53-ab6a-d0eeb3e681a2.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 0x09f9981d84bd6a28bc6dc2b2e0dc7064ed4c6f727289ac46cb8a2e0fa834854b. 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/BCR6R2100123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x344d5cbb7a49f125b856a64c99fbe3437b5d922c4f2a925b832087f2e717576a. 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/BCR6R2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da8d0e95692422468b69bb1874f1a9c49d3b4777f85b2f986b109a220e3a26d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BCR6R2100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3212668ff58f59bbaeb0c5d410f36f9b31de1f58f79ed1f2e18ef4b91267bee9. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/BCR6R2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c95bf380c730d78b4ccd3c665e96f831747065db31bd0a9f6d0622cdf012e69. 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/BCR6R2100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42de5c37d0407d2088a3f73dfb065b1b58bfb65b7895279aea53c4309c65de13. 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/GBRKQ2124061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1b082f951780a7ace305b36b418896631ff3bae39dd32a29e9160b68d3b5ae. 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/GBRKQ2124064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae09a1c432e58b8532e2f6b48b7c4b15aa79b207a94fd2e3feb07e72be345930. 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/GBRKQ2124066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ff2995cb9c4a1abb0eb1023b15ba481cb592d69df69c13df302ab8d9e4b4f7. 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/GBRKQ2151087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a28c06e5efe82cc65fb2f7bdb23ef55a34d816cf94010853743fe9b4b19212. 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/GBRKQ2151096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c7e73366276199d8136adff9d556d2e84248c6347c2f4631ad1f2eee2ca6f42. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBRKQ2151103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f8faa05ead6b11ee4beccdd7fdb2c61b5ce952a48e5f9b2554c826e9695678. 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/GBRKQ2165758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b47fa69da23764a1855bd0af4f00512276f19b2bf9a27f4aaf05b3628a9b39. 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/GBRKQ2165761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c243d23fd35bbc9f90ff2a350adced5337e06f585690c496364d9254468c5f0. 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/GBRKQ2165771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01487efbe1c9600b421d82e0b8c5021a442943f1edb0e6011bf2791cfcd653eb. 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/QZTRX2101616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8aca2656e43ff8f97554648bbfc0a9ab21686bcea20f34fd0464f2dd2904bc. 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/QZTRX2101606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fb54bbe144307195fce0e0eec67094ccfe2a2befb3b2553dee497339f65107. 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/QZTRX2101610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0032c2e3e0171265d1a777bb561aa723141aaf6a4997d29e58df6008929628c. 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/QZTRX2101613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc631ed3a5597c697eb5397e2535d8f2cd9082a934807768667588c21aa22d2a8. 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/QZTRX2101627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87ecf1d16f4540b0b04c438fdbbf9ad46133c748cae2199604e8a5f0be4db60. 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/QZTRX2101609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96ef180fceab66fe99d4c7d9956f5ae5289e757b92c4056c7ee4bd97c4669e2. 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/QZTRX2101621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8da5326b0df97ce9cbaa8bba7dd3981c05047b61e71432e3110222dd841b4b4. 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/BR9Z22000017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e6b7717bdeab03390c3d6ad9430d027c593de1a33bf6f91647f36b5a0083820. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA62150689.