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 0xdb1483722a4e900ccb9a2dfae33cf4ddfbe74167bfc3b872248d6eb5669e59b4. 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/9d57cd20-33ac-486b-8e48-d9da07420886.json and https://artists.proofprofile.net/proofs/artist/9d57cd20-33ac-486b-8e48-d9da07420886.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 0xe881c93f313cb04ee4b3d8e30c3292e61ff8a017462aa80b7b57e122d5fbf602. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/NLX9G2200278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3408e9750ee9949592ce8767fb2cc271886c8f74d7cac3b04c60bba1ddb9fad. 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/USANG2229907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69ddd53f50ae1722a2c615b0466398cd9442a5a9ea1b55c0840a53d961d396d4. 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/QM4TW2379481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3cb084b6f63c1b221ccfcbb1398544ab2c975ebb0dfb4cabc2a338456b7a312. 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/QM6N22326803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3209b1b5bd86e744b1d858c06b896304be6cf9e699122b970e07a6fea188aa3d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/UKZGC2300779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8523d94f6a0c54eb6754a119625d3f5fa14a3ac00487a7d46d732ccd17c7341. 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/QM3DF2207850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5330d5be569f7c4ab4f0b3dd817bdff3adbe6f2f8afd1cd371f74e9dba06d80. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QMANG2212291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78db6d85ed5a7f4d9b8a4601c41880f430ff63b68bbe03c0904921b431ead10. 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/NLX9G2400391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9831f89656dcd620c3c3516f05248c107b62cd3988593000763547542ed1da81. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLX9G2400397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a7ae129e067968c8c2745ffee7cb2919b86e0f60f4161487ffbed8dab601b3. 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/QM3DF2478295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e37a9a6fee6a7890025c5a09e88c876c1aad4d92da9a08f923ed3895c8a4c9. 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/US3DF2419410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7eb48f2765154314dc7b985a1c8fe9859058b2ce393e99db597285e30499038. 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/US3DF2476589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd1ad2afee45f5261fb1961dc9644b42979a050e27e121f6b0868e6d13d26e1. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/US3DF2478778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3f1c2559f579b9a4655af13db781b38d9984aa89c813f1aea12bf12c427815. 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/USANG2409575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb563260a24103726123ac75858ce3595209cf493a5f423aaaa2d103a8890986a. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T10:23:28Z), 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/USANG2409576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833587bc31a99cc3c3fe7686fb390685a7e6e371fa4544ace18aa63e3fe8a833. 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/USANG2409577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd091520ee60a77a799d11f5714a59a305d825273dbb1ade05c48282473d74de3. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T23:37:53Z), 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/USANG2409578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a8aa3e489be6237eff41d91947e543f3787c102547c9b95862070a396550354. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USANG2409579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd926bc7e75074c7cf509b1767adf7454888c65890cfef125cc5245348e337c70. 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/USANG2409573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7ef6dc8af06ae1ba339216d1a5a317169fdd97f88a21d1efe41b130268c810. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/USANG2416244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e8db12111812313ff943e5f5a63cfb9add71982afea78b3211f1555fa024a4. 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/USANG2424604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fa1d2dffd7eda88e1c3020d0f520dc84499fab3b7d416c5060836dcfffd6bf5. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:17:53Z), 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/US3DF2553307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b8efe39fe9aad7a49882fd9312032d2d8f9b3d48d09b94e838524e7425f811. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T21:48:08Z), 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/US3DF2553308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58ce16308882210c39b55176205e67f06338b4d5b7c127d92bc91e83a5df1f8. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T08:28:02Z), 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/US3DF2553309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d3f38cb664a65fa5fa3ee80446ab068169980dc90416162b70e66ce5128bf8e. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T16:17:08Z), 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/US3DF2553310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1211cccde1dd8b9a68729f48c10f9ef6c96ae97dccde8201613e0bca81b67b75. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:22:27Z), 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/US3DF2553312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70c16b19e148d50d2751f18d86ced1377c3c1e96cdae4aa11fa3400bb152833c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US3DF2463452.