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 0x41b16dce59aa0e4b647930903713273f91886ca641a1b9450f5bb7516a4913c4. 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/53849eba-80b8-4070-b70a-14c3c1d2732c.json and https://artists.proofprofile.net/proofs/artist/53849eba-80b8-4070-b70a-14c3c1d2732c.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 0xd506ba0866e01575f3935d3ba67714e1fbc5beba507bd6950a4acd19209b3ec3. Chain 2 (Bitcoin): anchored in block 958514 (2026-07-18T06:54:37Z), 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/USCGH0618117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f10408d1212f87201c3f313a9b836728f22dddfbf8174d1ee2291d045ae490. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/USCGH0618118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc13e95bcd4d8156cae4739e18373c9075c90ff99059f4f16dc2dbf515cebddd. 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/USCGH0618119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2569837215220fa64596b0c312300c14d230e2d7efc94a3eb0e01c17504f112. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USCGH0954240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa067c3105a212bb55cc0802033ab30ec6a95a62be74f97258393949ba9eacd08. 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/USCXH0700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62c95633807baded4e340f15bb1f7c81b1ccce22e12e5479156cd15816e4e556. 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/USCXH0700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3a92ce9df526e196a035b0fee93b8734d27c76f1b2d0c12e856e277e77ccc8. 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/QMC5V1500204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b5775386e943e0b63ee47b747d0c9a8c115692ef7f9638d81ccaf0b00df894. 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/QMC5V1500205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a92f96b7295bbb3bb5e23cc51a43167a0be6d892e340fe62a26784bec96d94. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/QMC5V1500206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ef3512c15b51174b46b57664d5e72742c379e491f8ce9b6a7bdff7b3278fec. 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/QMC5V1500225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c62dc3ffd344caedee1294066db69137e820c471752160e065d8442b491d20. 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/QMC5V1500227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb237ce8def86bfbc0997051e7e09eeb1327e352fe74a79b400b04efb3d026643. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QMC5V1500214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa587e90e150b1e23e8955d0264d74b0234fff82959a3d77c17fc57df9185084a. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USDY41866914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2840f452e3b6294f769d251cc39bcda72d9a9b497bbf7d2f62c40c29772eeca8. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/USDY41866917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c4bc43326c5d6967a2431c90353299ef8ef6bfe32550d37c0363898814bd562. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USDY41866918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6bd8d4f6c9e25c45898a39393fd2ad9af99d79fa53b23a6d9a914cc5fc35d9b. 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/USDY41866919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ef78b7f8c9646639be749db5db89602acccac9d8e151538510d53514e1ef90. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/USDY41866920.