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 0x63a2cb1158aa715bd6df43b22f5e24dd62b7c5953c30cce3996fce72faeff665. 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/807ceacb-b51f-416b-89ea-b7509e115be3.json and https://artists.proofprofile.net/proofs/artist/807ceacb-b51f-416b-89ea-b7509e115be3.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 0x96615bd3f92b4a067f1bdc3383844a67858d726da2101df1d8ca91f0f2275a9a. 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/QZPLS2441014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb93e8c6477d6323c57bd08a64456af1aa102caa180921ba1a4e76a0bb5e95929. 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/QZHN92455573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x821480d952ea5490cd78ee210ec58331b52af683ed1c80defdb4f88d27cb2692. 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/QZNWS2391954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa788a0c1d103c482c637c70f7f2d4319f3a2c0d0953227d9525be4b8544d3fb. 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/QZK6Q2388895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d60b244400b7ceb38f439501e6333ba0045424f80fb7a1dcf9ebede7ae2e5c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZNWT2136733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafd498fa37252abb10f87fd1e3acd6bbcda3578d637ce3256bfb838c6fd2d7f. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZNWT2136734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c553fcb23904ce2cd0e156d6fc0ac25b5b180f3164b2128f94018e84763fe12. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZNWT2136735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c54a5de49738589b6892952a8705b44ce054321d3ecdddb15eddec8ccf51abd. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZNWT2135108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f67a9c056e40f9d3486843c469abfdf01d0e7585e06f5dfe36187e9d1562b4. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZNWT2136736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9edf9aeb0ac1c9b42aa6ec1e1566a1b8cefc1ef4d1530197812d94c47e2ad34. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZNWT2136737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd68e99797d1e0dd3a1ee647a4235ee35bf75a936b39e82f43ceda2d0ba6aaf3. 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/QZNWT2135105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32dedac8cd80436238251e0465ab6d12894d09111b4243d158a56eeaab29d978. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZNWT2135106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05532aed40d58178cf2f02f1c9723f86c1af6fa70c754f95fc466c080529f1fc. 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/QZNWT2135107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c54a5de49738589b6892952a8705b44ce054321d3ecdddb15eddec8ccf51abd. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZNWT2135108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadbaa0c1d1437bec51f5fc508298d2535c5f4b56106d418ffee2752d1945c525. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZNWT2135109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c8d74b080ac513da057f3eccd55395a19916395f03eb42e43c0224d1d1d850. 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/QZNWT2135110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x252aa8dd084334d94bc1285096e0225281001195ec8d3d75fc2deb6e55625add. 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/QZCE61898988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe238aa5e010cfc66647cc315e9e4550137a92e25188a9ef02f8fdd80664a6aeb. 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/QZCE61898989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b93ddb366aeeb82f536e4b113e3c8fab0f3ae39323356edf69430ea335997b7. 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/QZCE61898990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd5f35db788136b22cec47ff1c3caadf16234e6df7b3ee14a219fc14a723a01. 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/QZCE61898991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd94dcd2e85306bc309f53d5bf4e6fd4f0d841d1f630e70afe217dcb0b9e3033. 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/QZCE61898992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa85bdbd45647ef6ae296513b6a125f7066e093faa0fb8000d908466b7eb77c2d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZBRF1895922.