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 0xcd06f85455efb7e5f9629d457739a9b3b6706fa1a7e7f927c327b981f0eeb948. 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/6473d92b-4b87-4258-846c-1527b9ac859c.json and https://artists.proofprofile.net/proofs/artist/6473d92b-4b87-4258-846c-1527b9ac859c.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 0xcd4e35b30238647cec813d52d2b92516bb7c6831ea5b72f55e3e1d305795d04c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TCADU1875327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07614e36f285a5ce234b5fef8ddf09d957adc38755f8a4f2e4e9f3c36ab19426. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TCAEX2001249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f0220c748964bf7db90adc7665be253e20a86d7e33a24cd1b4e5aa534c544d3. 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/TCAEX2001399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1c7d3c70548fff37cde0851d3bdda18c40cc135ea34d6872ebedeff5c37442. 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/TCAEP2080042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4900f050481a125c26b89466b2af3cef732a42d46c2c54cfcbe1cb5370ee19. 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/TCAFY2181323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c571f0ead44688bb2d68516a5c15337020a42c967cadbd9f675f7aa7e441f4. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/TCAGO2217321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c571f0ead44688bb2d68516a5c15337020a42c967cadbd9f675f7aa7e441f4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAGO2217321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cb3b60d08d6f012d4611ed967fc7deeb9e323fb24c06e70fd8274c3b9a033b. 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/TCAGZ2397929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c55f89eaf77bc2e9c5184ba241fdabb81ebdfda5f3290ebe92cece4dca1ef1. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/TCAIG2467141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdfd8e71201e92b25ae3026b44fd498aa0bbeb1459b4f793a4f4fcbd4fdfb134. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/TCAHY2488803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01e212110b0c22d692a3faa395518ec7b13151470cdcca5ae3e23976e054bc2. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/TCAIJ2463850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033feb97352e554a56eab353fea3b49622c66960820de6387b7b386c7f38d740. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAIJ2463876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5268095b90f1d312bbd30acf19a713d923b838210a51dcc2ffe3d7b51b4fba. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/TCAII2463954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033feb97352e554a56eab353fea3b49622c66960820de6387b7b386c7f38d740. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/TCAIJ2463876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb7b95a1f9f6d00bf3ea073958cb7c23a469683e8f4c28e08264317c4d8d118. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAII2463886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba94653cd55f6a75a32ff2b67f08733a581ff2e16d1389b1f7f2f4e80f812687. 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/TCAIY2463074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6707589e8d6c986a1a584bb1895252ee9069acc1dff3d9b5694b24ef802543dc. 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/QZWV32567012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619ab3ba947ac61de0f40b4f76023002a172f721a22dabdcaa441ddc709fc822. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZZ8A2573051.