Echos (Greek: 'sound', pl. echoi ; Old Church Slavonic: 'voice, sound') is the name in Byzantine music theory for a mode within the eight-mode system (oktoechos), each of them ruling several melo
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 0x09bb7c1df389b9ff7465ae8f0473622a8160af4a2fd9793f9fff50e55141e940. 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/127f840f-9c17-4c4d-93e9-1e30fec77a5f.json and https://artists.proofprofile.net/proofs/artist/127f840f-9c17-4c4d-93e9-1e30fec77a5f.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 0xcf175ea581c60432ac1eb89cd6c842568975a64f67e9e0aee8aa6fcceaa4e473. 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/TCACM1648031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e68250829d4b5c622e66616f616bae8376c0c1fcacd04e7c9db4ba569890966. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCACO1688944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc379a421cd3bf0455f49f9c6edce714e3fab7ec41a88e839fba852e876460ba7. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/USA2P1863836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c3afed539ddbd71ec1606e242ff3cb724d288774b77c2718a6192c7d6908df. 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/USA2P1863835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c3afed539ddbd71ec1606e242ff3cb724d288774b77c2718a6192c7d6908df. 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/USA2P1863835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04e0d0a9c73542058c3cb589a3d6cd307d790691da7cbd63d2151bf2053db4bf. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USA2P1863842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c3afed539ddbd71ec1606e242ff3cb724d288774b77c2718a6192c7d6908df. 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/USA2P1863835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc379a421cd3bf0455f49f9c6edce714e3fab7ec41a88e839fba852e876460ba7. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/USA2P1863836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14402196049d6aee0aa925663ddaade527f621e63742ff096d0dfe34a4db4bdc. 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/USA2P1926630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8070f4a5b227d8449258ff96d8ffc2ddb6387e44a738daf4126093687e6ef2. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/USA2P1928399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbba710fec66b472fbf815cdba7f0cf5b2aa6222e434473d4a4db661bd413fe2. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USA2P2146854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb7ec382f77260544a05e407a02d2d5f874d42c56c77e9e6506a505bb7883ad. 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/USA2P2146855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaebc37b16ca5bf875553bff3a4d68e58b90a878ec51f1592c2d5eec5030bf503. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USA2P2146857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6b839d898ee318878dd9858b384d1ddadfa575cf1659ffe253de2d8e97a022e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USA2P2146860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ecf4b705fc28fad31872ab0502e417765deba31125377f1502e327b3fa83ad5. 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/USA2P2146861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69caaee244fa95c2f977ba45b4f2b897d6bfbacecabd973a35135d1bca57027. 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/NLRD52257832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f800e57eeb7a3374b1c7def1433e2716967b4713fec7f257b7edc3be8f9aa44. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/NLRD52257833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58097ad849868c5634df7647adcc6d85bec71bbf508c67d39611ad1489125f80. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/NLRD52257834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76868291ab935691d92fc8927a6141c02ee7b2f48ccd663679f7e083934ad92e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/NLRD52257835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf87a7f1e98e960a80ac40ae068e2037feb26c9cbddb6016d7aef4345f6e1885c. 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/NLRD52257836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4fcbb30caec2522f4d14dc3ce6277368452e36ed3e5f27746eab16edb3a8cf. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/NLRD52257837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23ea6b4b766016f7fc72b7e6cfbe74ee8c6359e496a7a11dee05df90e195832. 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/QM6N22471928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e6670b64aa3b1abe750df059fcfba53d352372365b3f590710689468b9ace9. 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/QM4TX2439589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352859f3dc63ea465820bf7e228a4c6c3ff66422f3b4d077dccc965c4f001b74. 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/QMDA62402599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23ea6b4b766016f7fc72b7e6cfbe74ee8c6359e496a7a11dee05df90e195832. 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/QM6N22471928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e6670b64aa3b1abe750df059fcfba53d352372365b3f590710689468b9ace9. 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/QM4TX2439589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd902c0c9290474c9e792e878c1e2e3b3aaf0db2291a1d50341a24e8ffd6ee699. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCACK1580849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e05abfc8e057b220096cddd8a869142a4c186f1b96f92aeb9d9efa4401a0bf. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/CA6D21600312.
Every Piece Of Me (with Echos) [Ryan Hemsworth Remix]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06051c5116491965e2e41e32d67b848f66848c11b63904b919d306c1ef1dfd6b. 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/USUG12001769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde20021a52e2308882a68ea328ef335fe41d83926cdbd529f4d751f9f4f17783. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USUG11901632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d65efa057d353a02981b94f23daf69e8f8f9782e151c6ec342ffe6e4c5d5535. 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/TCACT1667089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e05abfc8e057b220096cddd8a869142a4c186f1b96f92aeb9d9efa4401a0bf. Chain 2 (Bitcoin): anchored in block 960145 (2026-07-29T21:13:37Z), 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/CA6D21600312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4fc9b0b5ca895f9140eceb310b4c93abb02ef78907ba60df039946a8a4c60b5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZ3CX1600200.
Sounds of Syndication, Vol. 2 (Presented by Syndicate)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f749fe2d7fd4fa76178a9a58f38969dbbe5b467ffb6bd5709e67a4becb6ac7d. 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/QZ3CX1600809.