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 0x18d92de4dcf05c2ddbe6aad5da84028a9d5bc0ccde762e822cef6260731ae50f. 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/d3124446-1017-433a-927b-67ad9ea204da.json and https://artists.proofprofile.net/proofs/artist/d3124446-1017-433a-927b-67ad9ea204da.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 0xc36eb85df9702ee477ff447bd1d23ce2d215321071743168f106416d01f44d22. 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/FR9W12026767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4d065fb00dff83387ddafaf59dc829fca9ee09ad7eee2d39464cc8d5e08920. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR9W12028953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17387d1ea834093cdff1b68b0b42a1e508bf7bbfaa5020f6c5ba259468c4dfef. 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/FR9W12029701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8964011de21463ce391786d2de41375401e0068bd2d92c3867c4ba86434afa5e. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FR9W12028954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4f463291058b1436432ea0e9152c01e6143e93a3fb4f2ca550f1171473c106. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/FR9W12030362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32ec29c183b335f051d39a16a15f8772b6a9545327133632c176d037a5218af. Chain 2 (Bitcoin): anchored in block 958271 (2026-07-16T09:16:54Z), 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/FR9W12028117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4d065fb00dff83387ddafaf59dc829fca9ee09ad7eee2d39464cc8d5e08920. 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/FR9W12028953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273dadd3be99a2787c65f71318d2a793decea3d9a6e1f23f659fc5ba62c8df3f. 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/FR9W12031992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5099b7b167b66f6f4ccf8ddf0961d0011410bfaeb052c9b31be7d6448e2c4c65. 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/FR9W12029705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fada683efd57af23895bd878d184eec40e2ea50c670120cc8f95b68b7a69ae5. 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/FR9W12030337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52778fd789c328b0e2dad4dfd0b1728948f4e9dbf7d6118ea99556f0aa7265b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR9W12031720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10c75feaa5d4f7a3a4218983b47f7f892db3d5d1ceecf91e39ee7534d5b2a9e. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/FR9W12029702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab44cb3dd933dadacf51506eff3a0b0e5b0a0a05ad40bef497e8dc058a7dbe1. 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/FR9W12228435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29beff68fdf9c22f9c753802ad526b77a364dd3422dfcacb805fd9b4896df7b0. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/FR9W12228570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f7933d4b3dd01aa6b5c186724191741abeece2c2363af27ac7a8215db4c2b8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/FR9W12228574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa503600356cd5b343320af9a3c1c8d3d524d2d13d906cdddd48910240ca21798. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/FR9W12228573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f7933d4b3dd01aa6b5c186724191741abeece2c2363af27ac7a8215db4c2b8. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/FR9W12228574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2592d1efece97d3c4e05f3dd600ecae85bd3c76c7ea42067e1b0e87b3093dec. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/FR9W12228571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d600ad9e1e1a2bbe325af5a6aaa3037a8501325498e685cbef1471011ea943. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/FR9W12235171.