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 0xcfd9fa7373181a9d10c5c1a2559a74468d2095073e4da870ec20352d0c8af0de. 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/a9f6bda2-8c41-41ca-b9b1-7116a32d2a08.json and https://artists.proofprofile.net/proofs/artist/a9f6bda2-8c41-41ca-b9b1-7116a32d2a08.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 0xb8ffd6129d7a5db9598a4361ad8d90892d3ad48ecdefaf7e89258f69fa75e9a4. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/TCAFU2171304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5fa5b865e75a6712e444f3fd9a7c19fab0b90c964d49112a042c44483c52db. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCAFU2171314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5aeedca3584aeea5384a0348b53da8c651bef26af99f4df9b3cd5b244ebad10. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAFU2171318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b04e21054e624582b5ad4c53e9665c68bf32f31477a81fe99b2ca92f9b4e1b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAFU2171385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96a3a1e261e0f7087dbe48cda52f86def9273a84e431242aa66f565067f2192a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAFU2171399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09487e4f09d079d686b9b58cf5103705814e946d04f5e6f2bd15e3b25c73f6b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFU2171409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4cdcb9af9248deb71df98891987e73946d74e7e6a5cbc41e7fce91dd4c3baa. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAFU2170778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9133cbedbb0f6e133f9bbbafe5c713218ea8438c9e6c1da722d927258731f073. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/TCAFU2170824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0f33656137f4456129eb1a5d49aa78b52665659ab1e137f51c6b9190e0cbd3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAFU2170842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8936cd64c8b8501cd4199e5248b7314a688c69484309c98eb94f8017aef22c3. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/TCAFU2170846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c8fec95f4893aa09ee360fd5a8d99010ac177f287f4ef7163f104dae6cced5. Chain 2 (Bitcoin): anchored in block 957830 (2026-07-13T09:15:55Z), 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/TCAFU2170857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01bd6fdac65b710e162f70e83f893bcd789daf5f2b4f9f08b9cca940892194b4. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/TCAFU2170881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9c26052a64ec3c8a8e3c8adb49ffd89f7962ac40d72a14d79ca6fccdf5ee33. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/TCAFU2170904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac92d91eccd0eab8780cbd2c8f4581a24e4da432895ea6140c8d1832c8ba641. 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/TCAFS2193154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd680e114c780977a02e43df7ecc265c676075027bd4020d04b63ab2400ff9f4. 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/IT2G32300030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc10c9e399d835810cd269551d769ed24923654558df1e707af951691a4c0fb9. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/ITRSE1600700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x496c14aa82b857a25c6802fb4093d1fb7afb4e5012aa56d4261edc228ea79584. 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/TCAFK2121325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498971a5bd11063fde50b98b06670b4f87583be1d76f39f563c49546e6f1bdc6. 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/TCAIP2423268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x498971a5bd11063fde50b98b06670b4f87583be1d76f39f563c49546e6f1bdc6. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/TCAIP2423268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e6ff2909620f781d7849f84d696eb2e4dfded5073759d140518e38afa33786. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/TCAEF1994860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e41c649b2d1315bd3b4b03a1700bf281bc610df484a47758425ff1b5d22ee4e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/IT2G32100125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4bc80723de4045b0a0a2470781342e8f6319fd9a6978e8c639a8a73f202562b. 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/QZTB42237785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d34e767dc40a40e10453134bed11a1f77980b6aff1ebee3f151212cb70f1af6. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/USL4R2019954.