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 0x7b81b9b626c73c5c5725fa245060c1a56cd7dd8a5f7a1b9fadb78a66f6640b80. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/138e99f7-0daf-4299-ba48-0fc3dc71df7a.json and https://artists.proofprofile.net/proofs/artist/138e99f7-0daf-4299-ba48-0fc3dc71df7a.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 0xb9ac1a79ea0fd3740b1db6019515248dcabd96787a76a8c4a81aa59604ee30c5. 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/ES71G2104677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1006823000d4e0b852fb282361421465b253ef536414133cbcf1fa4e9bf39d. 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/ES71G2104678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b40b77a655f5aebc507ee1487bb491ee91b7425cfab3804b47ad6702a5bc9fa. 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/ES71G2104679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa4422b85cc8fd6e0b06e9ee09553eda7388530888990d00523999f353d5095d. 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/ES71G2104680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x100c0606ddcb23f6e78fd79939b8c6a6998a03facd94948633ce0d892f99d151. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2104681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53d188617dc8da2c9a92f409881039089fbb84cebbdf6725585506f29451f3f6. 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/ES71G2104682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b802c93c7017f0c6c4cbf24f62265300c088c795bc1c50b8361477029b40193. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/ES71G2104683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x532e2f7086cdf74b1156c44064fa211c952a4db41e6a1c8e49aba2ceac7c170b. 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/ES71G2104684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7937840cf1454ab21cc74b4a55876891539a2d9dd517090bf081edf22c57552c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ES71G2104685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf08f41c09991d63bb37d6a823e7c22251f9faa4d75fc6b41d112e1908f0752e2. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/ES71G2104686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30bc3f8411ae1aa583d19c3790209d62e17186684b1803229d0e26ad9fdde465. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ES71G2104687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf941085aaa3e3a33dd127d20d7f73e54c609e851e3c0ddbfdbc1bc38d7f543a5. 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/ES71G2104688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe097a0307c29cc1ee4a3b20600f18243eef43ef6aae34dcd3fe9630f14f24e7f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES71G2104689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73ce1a1b8734acfa153a2d880ce91b8700091031b026098093e0b840c210b44. 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/ES71G2104690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7571e18c64900c33e6d4c4b4622a98ebf7f7ae5a0224caf811e22d03e37dc08c. 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/ES71G2104691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d46fd52760fdefe51af36fca12ea3ac0ba3a76bda5fb3a173916065b6ff785. 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/ES71G2104692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac23da46dee9858e14e448e8654a3707febb15e1d4a4cfef18ce15cd47ddf5d9. 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/ES71G2104693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2df26fa50011a042eda8f2ccdd2257e4b2b33ac159ee4a4313671732ffc5ffc. 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/ES71G2104694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad2743d12d55683907cf5dcdba4d2dbfc8ac442508bc2293eb43d7bbd6787af6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/ES71G2104695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d865984f01c0e7068f922319cf4dcae9969bce4282e66714c3121ef136779f. 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/ES71G2104696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16a0cc6084f46eae7f1403e386d4cddea636d70272209cb84159c0522d3626e. 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/CLLH22602144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9839823aaf364fc0f85ec174c77a789bf7a5d3a2b6e2869f12a0764a176aeb. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ES71G1820696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843360774b934a51b588472e3f66523117c880874238b6cf413a703bf69e1244. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ES71G1820697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa9b1eb3936fb0eafb5da547cb18b9c8459978562ad0e4edfc926995120940d. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ES71G1820698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b63b9f741eb15fe737ac4ebe0a43cd6452e7ffe9c32bed3753958aa0a06057a. 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/ES71G1820699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755d502d8ba4b9f4d7a0542a51d5130f81844ae642dda1bb4ee53a508905136f. 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/ES71G1820692.