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 0x263af479c062e2fde5c71305783a8de17a08dcb5e19fa9f6c17a1dfb1907d35b. 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/7aa6a132-05c4-4f68-985c-373dc0f91496.json and https://artists.proofprofile.net/proofs/artist/7aa6a132-05c4-4f68-985c-373dc0f91496.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 0x55fe5551e919d1eab5ba434c57bd5f269d297b44d09499629e00a2b249853362. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/DEW241200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf6a41d625cadda4f8372f7474752a974a8bf29f1c5c3e3695e119a1e37f8d5. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/DEW241200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c16e9b8d9ef1673aecc824fd04e82631770b116fd987658c37d4cff26b78248. Chain 2 (Bitcoin): anchored in block 957735 (2026-07-12T17:47:43Z), 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/DEW241200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b443d4ce8962d9a185aba8d8daa81c7df47525cf01012c12846cbbc050d0b5c. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/DEW241200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e84fb4a96671edcd329c65036d2f2a7776c2f84ffc9c3fd6f0079ae3030af6a. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEW241200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cf156bda17f81290c79b0319bb1cb457d88d276cb85da7b4582ff807230d59. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/DEW241400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3179feb3ed962450c9390db378908f94f1d3c414e225693432d3c116664da8bf. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/DEW241700100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc6a500f76c12d74888de37caa457bff68d9083b7266a1d0057232bc7dab6bd. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/DEW241700103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a51fd77b76644a59909ba301b37cc5e7b04ccdd367f755ec613506f8ba1d85. 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/DEW241700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c95ae67d9b71e3f84a90f02ef424c68dd5a47706efb16f6c19ad6a8748d8db8. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/DEW241700361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd297c9ec6e0a360a59a476fc6a643ffd11e520145402ce6f0a3caa4f2d7d6e1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEW241700353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1802d0318082f0241d8fb31cbea2ba2089a2d009b1af62f75b07fda2577becdb. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/DEW241700354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d1c8ca824fff19a4c6bde1170c3119fee4f9a12d7b909fb75fa94a940772ce. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/DEW241700355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec16ad26eda6fc958d994cce9c39dd612f35432b81322f105766d7faef7496f1. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/DEW241700356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e487b24d1f44834ffc85ad998690e39527fd17f22f0bd1c5d4689f87a0aafb. 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/DEW241700357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf9b3fa9c94dcacb6a844a12b7caee7d4514ef2bc85df2a117ad8002faa1f4b. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/DEQ022292230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb18281da930b4c9adecace96bfaea587059c5b72f5d887c83ce5283581be90. 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/DEQ022292233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31e5f2be80c865d9e0c23bacee1687e7bfd311c6c512946e487704a583c40ed. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/DEQ022292234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45eac9e9123d1aebaca9d73f44b537baa6fc9de87e37860c34ed4df9c85252b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEQ022292236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa513794437fb1bdacccc53df6a5ef74a78d5fffcdb45bb8c9803c39411bf03. 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/DEQ022292237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ecd9e0c94a70db12a62d37b52a1ad4425bc98fb63306dd036d4ec6adcf49846. 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/DEQ022292228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b49ac9a69122a24ecf0f9c8c25307d48cfa71de03259f1d55def0ef008ed54c. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/DEQ022292229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x776fd3855d8deaa76df1d8164f321a8f54c43c721d8b7a68c139963d3873b9f5. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:33:44Z), 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/DEQ022292231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad725357d3825b0da6f3df27ed3cdbefdd0dd3361cc218528b08993e1a34fe99. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:32:12Z), 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/DEQ022292235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c17d08f8bf6a0bfee2ce8fe962f90bb067274f15be89d6376a5b3c3715b6433. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:18:56Z), 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/DEQ022280938.