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 0xb24ba53151f12e467f78c659cd563c508407ad65babea9b6cada713664fb8cf6. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb47c9a9-e9e8-4d3c-9fa1-ff8527c7b4fa.json and https://artists.proofprofile.net/proofs/artist/cb47c9a9-e9e8-4d3c-9fa1-ff8527c7b4fa.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 0xdb3580e6f58514718bf3329b75a2c323358611d1a1f08da57c13fbe65263d4ee. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/TCAJL2505413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc43fc8c00d5b767f03148d68e1d1ad3da471bef5c298ec0906e528e38cab88. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAJL2505434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a39688797df2316c0fdb5c6be71858ea66a26ba5b960e6d69a73a33c5445329. 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/TCAJL2505538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04303c3d38e0317a22b4b4fcb7cf61d88c153a02a23c90d237e519d5dfdf6709. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCAJL2505561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ec426012d61097598bfdceb100a471ab76ce9459c51826648c13237866dbf1. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/TCAJL2505566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99883475c9d0faf8c22dad5d8c2609ef56522968ab9bf1e8758945d0145e5de. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/TCAJL2505601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adcbcdbdac1caf137091d249ffab3b5d73603da014ed2bdffb65d4ac8406159. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/TCAJL2536785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02008aaf35315d498b9eba072e5b3e6edb4a47458bc551e96b0604f988f774a2. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/TCAJL2536751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9fd36c1072c6049be939c8f77b95bf6853a5814382632b170073ea8b40a8965. 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/TCAJL2536793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e85f0c000038a6896cafa549f1ac4d6b19e3f60a3148fbdbefb405096b0ddb. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAJL2536928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa370ecf93cb86770c8bea2a18775f0350cdce6a8adf78222466cc8439883bc64. 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/TCAJM2536916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885337001080404cd895519ec5a02b0282265fbfb044af5cf66037f0f1033ef3. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/TCAJL2537020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eff4d433ce4c9660d478dc0c04669b5879994a9b0bcb8777132d40537c26f67. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAJL2536918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd72b9b7ecae0b07ee04dafc10690e4e7de3285f3cf4d664fa16323ce2a4608d. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/TCAJL2537099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64b9d00450d06313e3b5e9f8e64af619aafbfa04b10a5fd75c818ba62564244. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCAJL2537296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbe4d10f4cabf455eb8ac10afdbcc8d2f26573dab2ba21420f4bd78f20d409b2. 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/TCAJL2537505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac080c4ea5d913a827b65ddba54c3910ab0b73b78c0bf49a5fcf09cf8247c21. 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/TCAJL2537498.