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 0x1d92f0ce69eb47a8bacc02fd263f03aa7a09afb37a511510fe505e9152cb8118. 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/91d4cc68-e7eb-49af-9791-dd72ae972073.json and https://artists.proofprofile.net/proofs/artist/91d4cc68-e7eb-49af-9791-dd72ae972073.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 0xfaab1b52405caa31336b1faf3bba400d5500d2aac135948140fcb4ed3abb5658. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/BXAYY1500031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33bc6a40a34dc1edcec6a2d11515c95e4207e425b71a6c5d71c75e8625f995ba. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/BXAYY1500034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbdab5f507abc0a123d3ed89029a41f143221a74aff648c5e23a9c06649fca03. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/BXAYY1500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fc9789661328d26ad4b978eea128ef150e24906a3476c7c0ff9a552ad0ecc3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BXAYY1500038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5c7d9737164b25ae865be99a90c1eed290205845787047413b95cb019a6c04. 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/BXAYY1500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd666787b715bbbae8b5a7827c9095fb81b80c5f952be46b753f6296c10725617. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/BXAYY1500047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x549754b33da7a40ec6ecc17b10ecebc59267c8b4d6f2f0c7bfb897a1ca34d2b6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/BXAYY1500049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641a0b72e967691e67013d0b50f9097da7632c58d32edc941d8ac123af573a13. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BXAYY1500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcde32846f9b54d7d86b2d5c990392a5b20385c40f853c4963b3a3fe18f4b073. 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/BXAYY1500052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a81b5726302661fe490c13c473843c2820eec737e68bff8382dc33463897c95. 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/BXAYY1500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb8bb56d305dfe4724cd3b0f622bc52d1c6733d325aabda9c80d2c49da89c8a0. 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/BXAYY1500054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa762e6004c008f597e1327a09245227aaae3e193c815d9a3286f23eecb978209. 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/BXAYY1500055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8269ed86977318e89d1c48017d8affaa76d26d92859a0e3cad882a265e0b3ec1. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/BXAYY1500056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e4dfa6316a061c2620b2067da50db4ffa8c96e319106a3de41a6791416e49a. 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/BXAYY1500059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ba8341c298c482508e5484b526ded592c1c3ce366b5bcad86f189322410d33. 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/BXAYY1500060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f1d89e74084eb49def1b521d5afe4b001cc8f6082b5aad40964aa9fbe4398f0. 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/BXAYY1500063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c403e89c836eb4a8406129f54307104d28196ec887662b4d0e0e15b7975344. 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/BXAYY1500065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bed84302d69c18c45083824c8c629761bdb77917bf4bcf44ecb055ddbeaaab4. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/BXAYY1500066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49d71d0eb8e833bf3b93e55018acbddc312a77f5e3d2d22110df78862a3cb205. 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/BXAYY1500067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f97ff0d2330d024d9ed70c6eb07f67f7858e6209fc2d1b231d761f1a2d03309. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/BXAYY1500072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38bf34f299acc5bbc1e7eb2ca8e99e9f8ba9680948cd8f04c183ead9c9cfced. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/BXM5M1700001.