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 0xd896b5e73112118a46dee64d4085d0d6a9646a6a4eef56e627f18a6dabb936a4. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6c2156e-3a22-4e5e-9aae-ac5a9e42e590.json and https://artists.proofprofile.net/proofs/artist/f6c2156e-3a22-4e5e-9aae-ac5a9e42e590.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 0x90379ed0c19ddeaee78d75cd2e8476d260b65a0253ea4701e4d1c4d2598744fd. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ISV982120401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3da28ab7580e87ab50ee2ccc6e995442b0aa46197edde23990567491b343d75. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ISV982120404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f2bd57650fae4cba3ea1ca780e5321905f6a0a11619663a188bad2eebe6260. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/ISV982120406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c12dd1e061a2b44edc794328f0f3636a84f57c64867f46512c7291d7a4329b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ISV982120410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e86469c1164e686a39633639d086e5864fa2bb66c689924be28767e7f9855e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ISV982120411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3501e153cdb0380572561f55079bc340f19ca2d9aae0c394d1d16308e20a4d3. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ISV982120412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd242918731682c0613e5d8bdf4bc6885b09bf6b6f514f65ae785bde113e0b44a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISV982120413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf92623a07268a8e761d83a1d4885b69d11f67578396c8913e37d3226650db33e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ISV982120414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9631a04a7f6e943b479a1468e0fea9965b64cea946b7b9724908c04c878a3d5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISV982120415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1984ba5f50271b5ebec421cbd83dc21e8d0ffee1522289115e7ca83082552a2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ISV982120416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3134edbcb7f3bdb2898c7fb0e1f477b19c6d229f93b71a633022af3b2d860b5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISV982120417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f2f9014308756f67715ad409276f22bdd8b6f77ae0b105dbf79f35862d70a0. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ISV982120418.
Fóstbræðralag (úr söngvasafni Fóstbræðra 1916-2006)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80ebe53a1dc91b8346b84d669abae13be52eb901bbdbb7ab603ad422132f610. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ISW410600620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8494475d59190f28a193bebe38e70e013012b4d5450808924a9c9ef9860b381d. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/ISW410600626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4d0e31a872aa7683e1b1212bc6e8e81001755abad39f6ddf41e35f8bf6e9fa. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ISW410600628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x045ab203d9c54edcc8d31da939b05064e80acf4455fb7cdc6723e48e099f5b1b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISA109800401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4951cf8a34a85cfd63e957c466dfa98dc7307a52cccbea41e1797a14699ba147. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ISA109800402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac54c4035e6332940beda3b379937ec128e7a521f7cd8de285c32240ab239cb7. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/ISA109800403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06297ecd3df89b13a37c74e6bf2971c97d0f532160753ac5cea03888454278fa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISA109800404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1113149949ae405bac0320c3f8e7235383da7ccdda2c1f00fc76ebecd9f6955f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ISA109800405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0d2c0fae316b53356c82b943c6b7a6d691e4887043755090e0940bcc361b01c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ISA109800407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44832c65a0904ac8b5dd5dd31a90c6f1eb5921d85d210fc199605e24103383c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ISA109800408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x849132806fddad32e33f1874bb0ae907ba40e852c283b2ce9eaaf2f9b5175226. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISA109800410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb014d2ffc1b1ee8dc21801d7dd8d718ca354a0ba8bff24ce349f0f6a89d1154. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ISA109800413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x958905716399a381e8a8f4acb0b880ee54ab07a2dc6bc615a08a20351d11bb82. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ISA109800416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93884d52e63ed34a01e3a6fcb81706a85ba9d71bd824c1e08d53682ab588d546. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISA109800418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc56edded35162c517d07d561128f19afe933a2e7f1c1f7d7d6e144af83ffcf6. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ISA109602001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ffe0e1cc392c576a17e083a1ce993a7d357c2cd475f78698ac6783f961da1c. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/ISA109602002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdac54a1d668b74c5a87e678aa1da5704b7dcf9809f4e28c055f2f2fea1bbba88. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ISA109602003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadb0f633e2f11b1eb724c3b8fe190c668048a092539c2e9691cbcd226d1b58f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ISA109602004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6df57f369b49c3dc8b1aa03c9bcd461457d43183e35350eb95d82e0e0c48c7. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/ISA109602007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe26e41a35651eefb3b7298841e9413e908dffb1ee0492b71c87cfc2e2e4918f9. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/ISA109602008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5558ae5d46b20af777be3d1f016e272ddce0afbbfa12b86d8a116c693e5bc54. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ISA109602021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe89ff7e5c6983b6e9690446493649fee6a416e19ed9445589bf26bdba4602ca. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/ISA109302105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f60bc088caf12c98faa0c596c85bf932590abc2dcd4181f2542da4c9edd5147. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/ISZRU1012351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5545fd5511eb401bf299225073cdb3ca5f5b6533161fc4ff30a7108bd23cf1cc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISZRU1012355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c1f527fe8dbf520993c1cce0d98f48f95b5ce6e8deb40f712fd89956c47875. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/ISZRU1012357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1dbaa76b4e300ebf3c85fd9d98ccb2de5c7b5f79131e163dcd2e7d23615e07. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/ISA109104807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe1b716c364af4f2e4bfc41bbb5a2b32bacff4d8efdfd94db02a3b00cec8db9. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ISA109104809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea532e18bf9654490c40fb3b8120bdf4d226c7acb56e40a14432a878a79fe941. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ISA109104816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x802b8b974aac948b8f7acc609a02e879b7d655a14bb3660b714a4602a66a32fd. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ISZRU1009403.