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 0xdd62057c36aed32764473bdb39b8a10d2d4abe43df6eab83af04237ae5320a9b. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91c6bef8-ff2d-4080-8669-9cc2d2f01706.json and https://artists.proofprofile.net/proofs/artist/91c6bef8-ff2d-4080-8669-9cc2d2f01706.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 0x5a714c4dff96bc9c1f0b7755c5560c4286d9675e7c0b1b7dfc262e0124a4f7e2. 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/NLCK41092110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bdcfc72ac034a195a27a54a816e3fc02a839f6b8fd9e58726c6fba70ed63da1. 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/NLCK41092111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e3f00bd4f73fb0b44b9c0e085e78bae4131bdd94c3cfa8a54dc4457d8c2813. 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/NLCK41092112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e7b2c58ac5555f3c0ddc7d3f40c485f816e4f2ab8a2d5433e339e3d53130971. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/NLCK41092113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b97858dda7ca46e33158b0119d5924613334807e69765b6869fb0d0f27b55a6. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/NLCK41092114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea40299ff3211868b1cbd48178025b0809c87d3293616e90897be950fbe7707. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLCK41092115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87eda4b9dee63a1736c9fdc4f0fc5ff762c8c58c781af3f736735cbfc2785777. 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/NLCK41092116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e462c930e7a0143fab6fc4691184a422982d47d65ad669f2b616bb50443ccd. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NLCK41092117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea40299ff3211868b1cbd48178025b0809c87d3293616e90897be950fbe7707. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLCK41092115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7284aaa2dda0c7913cc5a7facabd4248c8a272111ede34f519494cc88d53aef. 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/DEH742000746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b2df103bc4d82be877379687cd86a45371f74926ed9c8ce33176df9af5a7c7. 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/DEH742000747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3486d3b8f45ebf8a84da82dfca99b3b9ef4f088243631c9abc6443eedffca9. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/DEH742000748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e28ab1c974507185e8f76196d9cd93217c50db4f0b65677fa939370c188bdb. 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/DEH742000749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17181a54f22a2968ad0613c1e8d3858e88709839987c8a3728c53fedda1e8868. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLCK42220250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb004878415edd1d5d8965ca6276495920574d2223af85920a89fbb384ebc2ed. 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/NLCK42220251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357ee7db7090f49c62a45383ab4750ee55a12e9e8fc8c84eb27d316961f078c6. 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/NLCK42220252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ae394634a544dfa156859ee71a745cae8672b78504810980a8850e71685bc1. 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/NLCK42220259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b062814308fa547c5a1460636fbf3f9de624153e9825243ea15dda7b4c9993. 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/CH6542124770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82690af35d124ab8ff0d865c68c6502e704929bc1cefaeb9143c543ce1724a11. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CH6542124792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee623bee6e3901eb96970082bb8f65ffabbdedb6481e04a7100356b81f9e866. 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/GBKQU2164162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06eff08963e82fe37f3718491fbcf41bd235d55200158e3d20c1967e8570279. 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/GBKQU2164167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a0252039303eea83be86bc5bb65f0ccf1be9edf06fa42d5ebb69b6b008ce39. 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/NLCK42237180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x779813b9c17efbaf32ce397750d85e95e91ad577ab81a20ba43e05b688735cd7. 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/NLCK42225312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x782d119dcc45704388fb789df2bd0b0da52da4c85c0406b059ec0389bfd2337c. 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/NLCK42218453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9441cd001924ed849ae4b5cb9892b22e230d93a527023969307656a0dbf60cf9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEH742159627.