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 0xa9439cdb8aa76bfcf5ea26fd9c0190ab64a81386a9deb11454b747b07499ba78. 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/0a74342f-5ea5-48a1-b1ed-1eb94ad789ec.json and https://artists.proofprofile.net/proofs/artist/0a74342f-5ea5-48a1-b1ed-1eb94ad789ec.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 0x8cfa643063e9f939bbab97ea14f5670d2c13fc1026f9b68ad282014aee60d8d4. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TCJPF2535371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58f202dd5527315f15a5ed9c374edc00446ceab32c7d07d796bb203a65f711e. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/TCJPW2354568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71bd390361128f9d69f57c2a2b177d0b6c013944c5d4dfb731fd46e9a928a1e9. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/TCJPW2354609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f65c12458654158fa7b2ddbd5c2b6524ac684c3fbdcf17d4d746e47655487e. 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/TCJPW2354616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210cbb2bdec9b7b69b6f097842cce4c9855dd964b6acb8f455e5676728c5a45c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/TCJPW2354621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb37b5841a13ff718bae44a230f671637d7f8481931988fe081e0458ca31cf7f. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/TCJPW2354628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7e31f851d68416243ffcb74b7fb2fc0237099ebcd38127410488d2491a8f4a. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/TCJPW2356755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8203c29506e7775e2b7e6febc6c48c5b265ac26863ab616cc112492424075bc1. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/TCJPW2354566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0946810069eb20ca0cb12ad40796e9fe2cbf4f5ceab613f0ef2ce4938737470. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/TCJPA2477439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b480759f62c4bfd7e790fef76b53deef30037c64fb3ac17a29a68aa41f824e. 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/TCJPA2477453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef05287b36a2f2df467b96de3f7db2fb8ab965420148f8d362356a406e9eb91. 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/TCJPA2477471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6342ab2b67044894d5a78a2e8cf2d082239446b217ad980365aa02349d49a3f3. 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/TCJPA2477485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceaa70dbd1c05700765428d79bbba6850f210f35d49811314d3133764a33129d. Chain 2 (Bitcoin): anchored in block 958785 (2026-07-19T21:40:06Z), 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/TCJPA2477493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60c2b5b0501a1a5ed5f2597772877320dd5f786b7d190546c96740d4635e1cdf. 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/TCJPF2535612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17483f241735c10052ac86b059adf8693c7f6076e5a4999b522e5b948ecfc419. 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/TCJPF2535618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96984af77feb79553d5972700cb1a7079a4d132a9d02be29b16b48950a4d21f5. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/TCJPF2535654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13789d52c09931da51487ee36736dc6e57e2b031fa3b6cb44939ca2336cc4ea5. 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/TCJPF2535682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacaa90597d009c2795902e8308762b886d5cf9d73f6b58b01153d42b4baa382b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCJPF2535635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd487228ce3803ef2d6cdf8eb1515204ecff7fb8ed6e7391cd9829b503f57565a. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/TCJPF2535690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c28ed5d7c69976e523fa78baa09b909f973d1a6803578c61487e80c4053e53a. 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/QT66J2563030.