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 0x5e8a3afcc30abfb94ca6b114ad4abc1a99727c72b9c7e240c8366bd7bf201270. 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/f9351193-eb85-48be-85fb-4508836049c2.json and https://artists.proofprofile.net/proofs/artist/f9351193-eb85-48be-85fb-4508836049c2.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 0x631a48d1103970aca563edb7490f85d7e9e9a4c5ab9a0aad2d37e21752365742. 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/USLD91741587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e106f765c5f5c53b5c6b5d9f73e8ac07c2d543e0695e12b5e8f8f6d9a81720d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USLD91741589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07530d3bb4fb7547588ab61438f8e04b085c0438dfe51ec3b80e26f91f7b042. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USLD91741591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22490581fbd8c40673c60847d3d156339a01dbdae515c1bc42a6d1ed5a2d6bd. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USLD91741603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562f97f7a1c8f83ecb12e5938069677953fc78f4f70bc8ad474e70fa65e2b4ed. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/USLD91741612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83472e731dac3000a9079535aef6d9944823ff31ec1945575ddb3baf9d090bd1. 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/USLD91741618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7908c48a23a561cd4bb6616c48e73f397684585d5379a0bb1f7fcf5c59e8d1. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USLD91741453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a71206ab2e1275b4ce2a7e5b991cdefd32ec675952db501a78fa64537eaeb8. 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/QZES72365536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0384d53cdf55040c5a51b32bec90b35cca61191c7c4ddc58c9684f4063641ec1. 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/USLD91756539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2f4e55d7114493d7f6598a406b4acefbc20e2459316d0cd5f9e460e690b782. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/USLD91773520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4a425d7822ff4a23df71bde27cafae97b7552c8604847cb14a860cecfb252b. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/USLD91774256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e161c9b53610a91f892f7c775fe52163487c26c243afd1a81b267f162aa23a. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/USLD91774258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2826006c3d99c0894d7e78f2fd60d6bb4b52a577b3f52ffde97872c7a8c6014. 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/USLD91774261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd501fb57ab181649f4cc6810d2b18566f74efe2393ffee0c0119a458271557. 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/USLD91774262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db3454128d670989d8566bfe4844a03a495c77a8e2b1a269c537ccc8d4c27cd. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/USLD91774268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1684f696881f5e91c3d9244eaa740f0010bee8753c76ed3b2e8984e03e71f39c. 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/USLD91779191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ef90fdd5a975cae7c49ae4497be7048b0b3b67b49b21fc1d9ad41e59d5eef3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZ9EM1803130.