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 0x954f5d465208e5f991025176fd05426aeb8bfc9514f29482acedf4d9464271d5. 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/97bf9653-54ec-4a1e-9c2a-a504adebf65c.json and https://artists.proofprofile.net/proofs/artist/97bf9653-54ec-4a1e-9c2a-a504adebf65c.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 0xcd4786e91b33cd9010fa58e7ae2330bb69d794ce9e0c2e828b47b59eb58aa158. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/FRX281940443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c4c384649663a66cbd15212e1ca310029758562f26e6323deff09d77331639. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FRX281940445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9143317e9e1dfde3b30916c1bf56480e5cf4e78c3f15263071f862dd8cd0726. 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/FRX281940448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc05d24d4f1b8ed83eca89af4d890eb2be57ecc5a40a9d4825a4e481692245c15. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/FRX281940450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a07fc34d156c2f18d622e7d73a6d4d5ee241369f89039a22f3f8e3042c664e1. 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/FR10S2066648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03380186a0cf332cbf695cf28d3e1948e2079a2e56796712592cf836bfcfebd5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/FR10S2066545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c91e812ca14a5e6af97396acb455f71699a505157ee624c12525ca145fbb757. 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/FR59R2079140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd478a867b26bcc87236a3338da465683150aa02885a3ecdf22a10efa72387276. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/FR59R2079142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bbfc5cf9ea4a98c63391eb9c98d54160a36c8607c62700c46aee4e0d9fc5652. 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/FR59R2079143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2412b6ee614a18759f2e84224f3a4f8de1d4ddcd84f2e40f1ffc632548cad158. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/FR26V2017935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74783d3624348e447166a64a9180c6119abf28c6f9ed092ae59146e8d13f585. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/FRX762324634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x222b124c7524616c77862a58f028000f10e68e71fe96d4de9c657d0811133f6f. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/FRX762324635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31caea4ee762ab060c7a213ba68a3e87fa2b1edc443d52b0dc2cf0dbd7446dd. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/FRX762324636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebf95c549b9a1a4b0ef4180bfab0fea2270a1554ed3dc09deb6028373351a2e. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/FRX762324640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe22ba9fa7af42ea18b05e1133c77dc8bf0942cf78886b4d0ea00b83df8b93b. 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/FRX762324643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85db8f1b42c72500e0a476518b06387a01f805aa4d368e37f0f873411c73f610. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/DGA062308360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc61bb9385605fa874d7a8d015a4594bfa7f3d2b50d0bc0767257af373680d9. 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/DGA062308361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4729085d9d064175c5f6913c57cb10fc72270de51557a96e3f6d5ddc25a38fc. 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/DGA062308321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd694f6d8061f5da669a0f86e354ea074f814bea0b6e396454601c9a83021b8e8. 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/DGA062308322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe854981b87413ae5dfd8dd081708c1ae65fc4ff0d91094c62251460fea06772a. 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/DGA062308327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb207fc947c4292a2ed7166c32b893bb3b363d37778650ccd2cae6ba05cdda2. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/DGA062308365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80889604f6b9baf4f31be93f8e322a2f1bf70bc2b168b777182afbd227f2c126. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/DGA062308366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c2f81c09e9c28467688ad5af1a4895c02720c4429a9fc72b29a9a15ada12c9. 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/DGA062308367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a28238f58d880710532b2d190f99b529782e9cd2341e8c0bcbeb9da85a7fa3. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DGA062308368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd3731464c7878a1e3aa617bb3371a767c30a984062083f3cdb67a319b338d8. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DGA062308370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe703ca7feb4fb19977bb237f9b21388ccd3a19bdce13a5aad60f2dd3c14db6. 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/DGA062308372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe353f4f8506a3524f935cfa22a58bad2fd9f89f7bff433a07404eb74a8a5bb12. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/DGA062308373.